Grandstream Networks, Inc.
HandyTone-502
Dual FXS Port
Analog Telephone Adaptor
HT–502 User Manual www.grandstream.com
Firmware Version 1.0.0.29 support@grandstream.com
T
ABLE OF CONTENTS
HT–502 User Manual
WELCOME.................................................................................................................................................... 4
Safety Compliances ...................................................................................................................4
Warranty....................................................................................................................................4
CONFIGURE YOUR HT–502 ....................................................................................................................... 5
EQUIPMENT PACKAGING............................................................................................................................... 5
CONNECT YOUR ATA .................................................................................................................................. 5
CONFIGURE YOUR ATA ............................................................................................................................... 6
Five easy steps to Configure the HT–502 .................................................................................6
PRODUCT OVERVIEW ................................................................................................................................7
KEY FEATURES............................................................................................................................................ 7
BASIC OPERATIONS .................................................................................................................................. 9
BECOME FAMILIAR WITH VOICE PROMPT ....................................................................................................... 9
PLACING A PHONE CALL............................................................................................................................. 10
Phone or Extension Numbers..................................................................................................10
Direct IP Calls ........................................................................................................................10
Call Hold.................................................................................................................................11
Call Waiting ............................................................................................................................11
Call Transfer ...........................................................................................................................11
3-Way Conferencing................................................................................................................12
CALL FEATURES ...................................................................................................................................... 13
T.38 FAX................................................................................................................................................... 13
CONFIGURATION GUIDE ......................................................................................................................... 14
CONFIGURING HT–502 THROUGH VOICE PROMPT....................................................................................... 14
CONFIGURING HT–502 WITH WEB BROWSER ..................................................................................... 15
ACCESS THE WEB CONFIGURATION MENU .................................................................................................. 15
END USER CONFIGURATION ....................................................................................................................... 16
ADVANCED USER CONFIGURATION ............................................................................................................. 18
SAVING THE CONFIGURATION CHANGES ..................................................................................................... 24
Rebooting the HT–502 from Remote.......................................................................................24
SOFTWARE CONFIGURATION ................................................................................................................ 25
FIRMWARE UPGRADE THROUGH TFTP/HTTP ............................................................................................. 25
IVR Method .............................................................................................................................25
Upgrade through HTTP ..........................................................................................................25
Upgrade through TFTP...........................................................................................................25
No Local TFTP Server ............................................................................................................26
Firmware and Configuration File Prefix and Postfix.............................................................26
Managing Firmware and Configuration File Download........................................................26
RESTORE FACTORY DEFAULT SETTING.............................................................................................. 27
FACTORY RESET................................................................................................................................... 27
GLOSSARY OF TERMS ............................................................................................................................ 28
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ABLE OF FIGURES
HT–502 User Manual
FIGURE 1: CONNECTING THE HT–502 .............................................................................................................5
FIGURE 2: CONFIGURING THE HT–502 ............................................................................................................ 6
FIGURE 3: LOG-IN WEB CONFIGURATION PAGE OF THE HT–502 .................................................................... 16
FIGURE 4: SCREENSHOT OF ADVANCED CONFIGURATION PAGE ...................................................................... 18
FIGURE 5: SAVING CONFIGURATION CHANGES SCREENSHOT ..........................................................................24
TABLE OF TABLES
HT–502 User Manual
TABLE 1: DEFINITIONS OF THE HT–502 CONNECTORS ..................................................................................... 5
TABLE 2: DEFINITIONS OF THE HT-502 LEDS ..................................................................................................6
TABLE 3: HT–502 TECHNICAL SPECIFICATIONS ............................................................................................... 8
TABLE 4: HT – 502 HARDWARE SPECIFICATIONS .............................................................................................9
TABLE 5: HT–502 IVR MENU DEFINITIONS ...................................................................................................... 9
TABLE 6: HT–502 CALL FEATURE DEFINITIONS .............................................................................................13
TABLE 7: HT–502 BASIC CONFIGURATION SETTINGS DEFINITIONS ................................................................. 17
TABLE 8: HT–502 DEVICE STATUS PAGE DEFINITIONS...................................................................................18
TABLE 9: HT–502 ADVANCED CONFIGURATION PAGE DEFINITIONS ................................................................ 19
TABLE 10: HT–502 INDIVIDUAL ACCOUNT SETTINGS DEFINITIONS ..................................................................21
CONFIGURATION GUI INTERFACE EXAMPLES
HT–502 User Manual
(http://www.grandstream.com/user_manuals/GUI/GUI_HT502.rar)
1. SCREENSHOT OF ADVANCED USER CONFIGURATION PAGE
CREENSHOT OF BASIC SETTINGS CONFIGURATION PAGE
2. S
3. S
CREENSHOT OF FXS PORT 1 CONFIGURATION LOGIN PAGE
4. SCREENSHOT OF FXS PORT 2 CONFIGURATION PAGE
5. SCREENSHOT OF STATUS CONFIGURATION LOGIN PAGE
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WELCOME
Thank you for purchasing Grandstream’s HT–502, the affordable, feature rich Analog Telephone Adaptor.
Grandstream HandyTone-502 is a new addition to the popular HandyTone ATA product family. It features
the rich audio quality, a broad range of voice codecs, and functionality of the HT–502, including two (2)
FXS ports each with independent SIP accounts and
This manual will help you learn how to operate and manage your HandyTone-502 Analog Telephone
Adaptor and make the best use of its many upgraded features including simple and quick installation, 3way conferencing, and direct IP-IP Calling. This HT–502 is very easy to manage and configure, and ius
specifically designed to be an easy to use and affordable VoIP solution for both the residential user and
the tele-worker.
S
AFETY COMPLIANCES
The HT–502 phone complies with FCC/CE and various safety standards. The HT–502 power adaptor is
compliant with UL standard. Only use the universal power adapter provided with the HT–502 package.
The manufacturer’s warranty does not cover damages to the phone caused by unsupported power
adaptors.
WARRANTY
If you purchased your HT–502 from a reseller, please contact the company where you purchased your
phone for replacement, repair or refund. If you purchased the product directly from Grandstream, contact
your Grandstream Sales and Service Representative for a RMA (Return Materials Authorization) number
before you return the product. Grandstream reserves the right to remedy warranty policy without prior
notification.
Caution: Changes or modifications to this product not expressly approved by Grandstream, or operation
of this product in any way other than as detailed by this User Manual, could void your manufacturer
warranty. Please do not use a different power adaptor with the HT–502 as it may cause damage to the
products and void the manufacturer warranty.
• This document is contains links to Grandstream GUI Interfaces. Please download these examples
http://www.grandstream.com/user_manuals/GUI/GUI_HT502.rar for your reference.
• This document is subject to change without notice. The latest electronic version of this user manual
is available for download @:
• Reproduction or transmittal of the entire or any part, in any form or by any means, electronic or print,
for any purpose without the express written permission of Grandstream Networks, Inc. is not
permitted.
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http://www.grandstream.com/user_manuals/HT-502.pdf.
CONFIGURE YOUR HT–502
Configuring your HT–502 and connecting the unit to the VoIP network is very simple. The HT–502 is easy
to configure using the embedded GUI pages and the following five (5) steps outlined below. Before you
begin, please verify the contents of the HT–502 package. Download examples of the GUI Interfaces from:
http://www.grandstream.com/user_manuals/GUI/GUI_HT502.rar.
EQUIPMENT PACKAGING
Unpack and check all accessories. Equipment included in the package:
• one 12V universal power adapter
• one Ethernet cable
• one device unit
CONNECT YOUR ATA
First, familiarize yourself with the features of the HT–502. The HT–502 has two FXS ports. Each FXS
port can have a separate SIP account. This is a key feature of HT–502. Both ports can make calls
concurrently.
FIGURE 1: CONNECTING THE HT–502
HT-502
Front View
LED Buttons
(green/red)
ABLE 1: DEFINITIONS OF THE HT–502 CONNECTORS
T
Power Cable
WAN Port (RJ-45)
LAN Port (RJ-45)
RESET
PHONE1 (RJ-11)
Connect your PC to the LAN to find IP address from your Router/DHCP Server.
Connect to the internal LAN network or router.
Connect the LAN port with an Ethernet cable to your modem Ethernet port.
Factory Reset button. Press for 7 seconds to reset factory default settings.
FXS port to be connected to analog phones.
RJ-45 Ports
10/100 Mbps
HT-502
Back View
Reset
+5V/1200mA
RJ-11 FXS Ports
(Phone)
PHONE2 (RJ-11)
FXS port to be connected to analog phones.
There are five (5) LED buttons that help you manage the status of your HandyTone.
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ode
TABLE 2: DEFINITIONS OF THE HT-502 LEDS
Power LED
WAN LED
LAN LED
PHONE1 /
PHONE2 LED
Indicates Power. Remains ON when Power is connected and turned ON.
Indicates LAN (or WAN) port activity.
Indicates PC (or LAN) port activity.
Indicate status of the respective FXS Ports-PHONE1 / PHONE2 on the back
panel
Busy - ON (Solid Green)
Available - OFF
NOTE: All LEDs display green when ON.
CONFIGURE YOUR ATA
The HT–502 is easy to configure using the embedded GUI pages and the following five (5) steps.
FIVE EASY STEPS TO CONFIGURE THE HT–502
1. Connect a standard touch-tone analog telephone (or fax machine) to first FXS port.
2. Connect another standard touch-tone analog telephone (or fax machine) to second FXS port.
3. Insert the Ethernet cable into the WAN port of HT–502 and connect the other end of the Ethernet
cable to an uplink port (a router or a modem, etc.)
4. Connect a PC to the LAN port of HT–502.
5. Insert the power adapter into the HT–502 and connect it to a wall outlet.
F
IGURE 2: CONFIGURING THE HT–502
FXS
Internet ADSL/Cable
M
m Ethernet
FXS
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PRODUCT OVERVIEW
The new HT–502 has a new sleek compact design and offers superb audio quality, rich feature
functionality, security protection, and is easy to configure. The HT–502 features dual FXS interface for
The HT–502 is a full feature voice and fax-over IP device that offers a high-level of integration including
dual 10M/100Mbps network ports with integrated router, NAT, DHCP server, dual port FXS telephone
gateway, market-leading sound quality, rich functionalities, and a compact and lightweight design. The
HT–502 fully compatible with SIP industry standard and can interoperate with many other SIP compliant
devices and software on the market. Moreover, it supports comprehensive voice codecs including G.711
(a/µ-law), G.723.1, G.726, G.728, G.729A/B/E and iLBC.
KEY FEATURES
2 RJ-45 (LAN)
Ethernet
Ports
DHCP
Server/
Client
FXS
Port
2 No Yes
PSTN
Pass –
through
Voice Mail
Indicator
Voice Codec
iLBC, T.38,
G.711, G.723,
G.726, G.728,
G.729A/B/E
Remote
Configuration
TFTP/HTTP
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TABLE3: HT–502 TECHNICAL SPECIFICATIONS
Telephone Interfaces
Network Interface
LED Indicators
Reset Button
Voice over Packet
Capabilities
HT–502 Analog Telephone Adaptor
2 FXS ports, 2 SIP accounts
Two (2) 10M/100 Mbps, RJ-45
Power, WAN, LAN, PHONE1 and PHONE2
Factory Reset button.
Voice Activity Detection (VAD) with CNG (comfort noise generation) and
PLC (packet loss concealment), Dynamic Jitter Buffer,
Modem detection & auto-switch to G.711,
Packetized Voice Protocol Unit (supports RTP/RTCP and AAL2 protocol),
G.168 compliant Echo Cancellation, LEC (line echo cancellation) with NLP
Voice Compression G.711 + Annex I (PLC), Annex II (VAD/CNG format) encoder and decoder,
G.723.1A, G.726(ADPCM), G.729A/B/E, iLBC
G.726 provides proprietary VAD, CNG, and signal power estimation
Voice Play Out unit (reordering, fixed and adaptive jitter buffer, clock
synchronization), AGC (automatic gain control),
Status output, Decoder controlling via voice packet header
DHCP Server/Client
Yes, NAT Router or Switched Mode
Fax over IP T.38 compliant Group 3 Fax Relay up to 14.4kpbs and auto-switch to
G.711 for Fax Pass-through (pending), Fax Datapump V.17, V.19, V.27ter,
V.29 for T.38 fax relay
QoS
IP Transport
Diffserve, TOS, 802.1 P/Q VLAN tagging
RTP/RTCP
DTMF Method Flexible DTMF transmission method, user interface of In-audio, RFC2833,
and/or SIP Info
IP Signaling
Provisioning
Control
SIP (RFC 3261)
TFTP, HTTP, HTTPS (pending)
TLS/SIPS
Management Syslog support, HTTPS and telnet (pending), remote management using
Web browser
Support Layer 2 (802.1Q, VLAN, 802.1p) and Layer 3 QoS (Tos, DiffSery,
MPLS)
Auto/manual provisioning system
Power
Environmental
Dimensions
Output: 12VDC / Input: 100–240 VAC/50-60 Hz
Operational: 32
Storage: 10
o
–104oF or 0o–40oC
o
–130o F / Humidity: 10–90% Non-condensing
(H x W x D)
Short and long haul
Call Handling
Features
Caller ID
Polarity Reversal /
REN3: Up to150 ft on 24 AWG line
Caller ID display or block, Call waiting caller ID, Call waiting/flash, Call
transfer, hold, forward, mute, 3-way conferencing
Bellcore Type 1 & 2, ETSI, BT, NTT, and DTMF-based CID
Yes
Wink
EMC EN55022/EN55024 and FCC part15 Class B
Safety
UL
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TABLE 4: HT – 502 HARDWARE SPECIFICATIONS
LAN Interface
2 x RJ45 10/100Mbps (integrated router)
LED
Universal
Switching
Power Adaptor
Dimension
Weight
Temperature
Humidity
Compliance
5 LEDs (GREEN)
Input: 100-240V AC, 50/60Hz, 0.5A Max
Output: 12V DC, 1.25A
UL certified
32~104°F / 0~40°C
10% - 90% (non-condensing)
FCC, CE
B
ASIC OPERATIONS
BECOME FAMILIAR WITH VOICE PROMPT
HT–502 stores a voice prompt menu (Interactive Voice Response or IVR) for quick browsing and simple
configuration. The IVR menu and the LED button work with any of the FXS port. To enter the IVR menu,
pick up the handset and dial “***”.
TABLE 5: HT–502 IVR MENU DEFINITIONS
Menu Voice Prompt Options
Main Menu
01
02
03
04
05
07
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“Enter a Menu Option” Press “*” for the next menu option
Press “#” to return to the main menu
Enter 01-06, 47, 86, 99 menu options
“DHCP Mode”,
“Static IP Mode”
“IP Address “ + IP address The current WAN IP address is announced
“Subnet “ + IP address Same as menu 02
“Gateway “ + IP address Same as menu 02
“DNS Server “ + IP address Same as menu 02
Preferred Vocoder
Press “9” to toggle the selection
If using “Static IP Mode”, configure the IP address
information using menus 02 to 05.
If using “Dynamic IP Mode”, all IP address information
comes from the DHCP server automatically after reboot.
If using “Static IP Mode”, enter 12 digit new IP address.
Press “9” to move to the next selection in the list:
• PCM U / PCM A
• G-723
• G-729A/B/E
• G-726-32
• G728
• iLBC
10
12
13
14
15
“MAC Address” Announces the Mac address of the unit.
WAN Port Web Access
Firmware Server IP
Address
Configuration Server IP
Address
Upgrade Protocol
Press “9” to toggle between enable / disable
Announces current Firmware Server IP address. Enter 12
digit new IP address.
Announces current Config Server Path IP address. Enter
12 digit new IP address.
Upgrade protocol for firmware and configuration update.
Press “9” to toggle between TFTP / HTTP
16
17
Firmware Version
Firmware Upgrade
Firmware version information.
Firmware upgrade mode. Press “9” to toggle among the
following three options:
- always check
- check when pre/suffix changes
- never upgrade
47
“Direct IP Calling”
Enter a 12 digit IP address to make a direct IP call, after
dial tone. (See “Make a Direct IP Call”.)
99
“RESET”
“Invalid Entry”
Press “9” to reboot the device. See p. 27 for factory reset.
Automatically returns to main menu
Five Success Tips when using the Voice Prompt
1. “*” shifts down to the next menu option
2. “#” returns to the main menu
3. “9” functions as the ENTER key in many cases to confirm an option
4. All entered digit sequences have known lengths - 2 digits for menu option and 12 digits for IP
address. For IP address
, add 0 before the digits if the digits are less than 3 (i.e. - 192.168.0.26
should be key in like 192168000026. No decimal is needed).
5. Key entry can not be deleted but the phone may prompt error once it is detected
PLACING A PHONE CALL
PHONE OR EXTENSION NUMBERS
1. Dial the number directly and wait for 4 seconds (Default “No Key Entry Timeout”); or
2. Dial the number directly and press # (Use # as dial key” must be configured in web configuration).
Examples:
1. Dial an extension directly on the same proxy, (e.g. 1008), and then press the # or wait for 4 seconds.
2. Dial an outside number (e.g. (626) 666-7890), first enter the prefix number (usually 1+ or international
code) followed by the phone number. Press # or wait for 4 seconds. Check with your VoIP service
provider for further details on prefix numbers.
D
IRECT IP CALLS
Direct IP calling allows two parties, that is, a FXS Port with an analog phone and another VoIP Device, to
talk to each other in an ad hoc fashion without a SIP proxy.
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Elements necessary to completing a Direct IP Call:
1. Both HT–502 and other VoIP Device, have public IP addresses, or
2. Both HT–502 and other VoIP Device are on the same LAN using private IP addresses, or
3. Both HT–502 and other VoIP Device can be connected through a router using public or private IP
addresses (with necessary port forwarding or DMZ).
To make a direct IP call
1. Pick up the analog phone then access the voice menu prompt by dial “***”
2. Dial “47” to access the direct IP call menu
3. Enter a 12-digit target IP address after the dial tone and voice prompt “Direct IP Calling”
Destination ports can be specified by using “*4” (encoding for “:”) followed by the port number.
Examples:
a) If the target IP address is 192.168.0.160, enter the 12 digit IP address (e.g. 1921680160) after
the voice prompt followed by the “#” key or wait for 4 seconds. The default destination port 5060
is used if no port is specified.
b) If the target IP address/port is 192.168.1.20:5062
, enter the 12 digit IP address + *45062 (e.g.
1921680160*45062) after the voice prompt followed by the “#” key or wait for 4 seconds.
NOTE: When completing direct IP call, the “Use Random Port” should set to “NO”. You can not
direct IP calls between FXS1 to FXS2 since they are using same IP.
CALL HOLD
make
Place a call on hold by pressing the “flash” button on the analog phone (if the phone has that button).
Press the “flash” button again to release the previously held Caller and resume conversation. If no “flash”
button is available, use “hook flash” (toggle on-off hook quickly). You may drop a call using hook flash.
C
ALL WAITING
Call waiting tone (3 short beeps) indicates an incoming call, if the call waiting feature is enabled. Toggle
between incoming call and current call by pressing the “flash” button. First call is placed on hold. Press
the “flash” button to toggle between two active calls.
C
ALL TRANSFER
Blind Transfer
Assume that call Caller A and B are in conversation. A wants to Blind Transfer B to C:
1. Caller A presses FLASH on the analog phone to hear the dial tone.
2. Caller A dials *87 then dials caller C’s number, and then # (or wait for 4 seconds)
3. Caller A can hang up.
NOTE: “Enable Call Feature” must be set to “Yes” in web configuration page.
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Caller A can place a call on hold and wait for one of three situations:
1. A quick confirmation tone (similar to call waiting tone) followed by a dial tone. This indicates the
transfer is successful (transferee has received a 200 OK from transfer target). At this point,
Caller A can either hang up or make another call.
2. A quick busy tone followed by a restored call (on supported platforms only). This means the
transferee has received a 4xx response for the INVITE and we will try to recover the call. The
busy tone is just to indicate to the transferor that the transfer has failed.
3. Continuous busy tone. The phone has timed out. Note: continuous busy tone does not indicate
the transfer has been successful, nor does it indicate the transfer has failed. It often means there
was a failure to receive second NOTIFY – check firmware for most recent release.
Attended Transfer
Assume that Caller A and B are in conversation. Caller A wants to Attend Transfer B to C:
1. Caller A presses FLASH on the analog phone for dial tone.
2. Caller A then dials Caller C’s number followed by # (or wait for 4 seconds).
3. If Caller C answers the call, Caller A and Caller C are in conversation. Then A can hang up to
complete transfer.
4. If Caller C does not answer the call, Caller A can press “flash” to resume call with Caller B.
NOTE: When Attended Transfer fails and A hangs up, the GXW will ring back user A to remind A that B
is still on the call. A can pick up the phone to resume conversation with B.
3-W
AY CONFERENCING
Bellcore Style 3-way Conference
The HT–502 supports Bellcore Style 3-way Conference only.
Directions for using 3-Way Conferencing:
1. Caller A presses “flash” to receive a dial tone. (Hook Flash for older model phones).
2. Caller A dials Caller C’s number then # (or wait for 4 seconds).
3. If Caller C answers call, then Caller A presses “flash” to bring Parties B & C into conference.
4. If Caller C does not answer the call, Caller A can press “flash” to resume call with Caller B.
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CALL FEATURES
The HT–502 supports all the traditional and advanced telephony features.
ABLE 6: HT–502 CALL FEATURE DEFINITIONS
T
Key Call Features
*30
*31
*50
*51
*67
*70
*71
*72
*73
*82
*87 Blind Transfer
*90
*91
*92
Block Caller ID (for all subsequent calls)
Send Caller ID (for all subsequent calls)
Disable Call Waiting (for all subsequent calls)
Enable Call Waiting (for all subsequent calls)
Block Caller ID (per call)
Disable Call Waiting (per call)
Enable Call Waiting (per call)
Unconditional Call Forward. Dial “*72”, wait for dial tone. Dial the forward number and
“#” for a dial tone, then hang up.
Cancel Unconditional Call Forward. To cancel “Unconditional Call Forward”, dial
“*73”, wait for dial tone, then hang up.
Send Caller ID (per call)
Busy Call Forward. Dial “*90” , wait for dial tone. Then dial the forward number and “#”
for a dial tone, then hang up.
Cancel Busy Call Forward. To cancel “Busy Call Forward”, dial “*91”, wait for dial tone,
then hang up.
Delayed Call Forward. Dial “*92”, wait for dial tone. Then dial the forward number and
“#” for a dial tone, then hang up.
*93
Flash/Hook
Cancel Delayed Call Forward. To cancel Delayed Call Forward, dial “*93”, wait for dial
tone, then hang up.
Toggles between active call and incoming call (call waiting tone). If not in conversation,
flash/hook will switch to a new channel for a new call.
T.38 FAX
HT–502 supports fax in two modes: 1) T.38 (Fax over IP) and 2) fax pass through.
T.38 is the preferred method because it is more reliable and works well in most network conditions. If the
service provider supports T.38, please use this method by selecting T.38 as fax mode
service provider does not support T.38, pass-through mode may be used.
To send or receive faxes in fax pass through mode, users must select all the Preferred Codecs to be
PCMU/PCMA (G.711-u/a).
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(default). If the
CONFIGURATION GUIDE
CONFIGURING HT–502 THROUGH VOICE PROMPT
DHCP MODE: Select voice menu option 01 to enable HT–502 to use DHCP.
STATIC IP MODE: Select voice menu option 01 to enable HT–502 to use STATIC IP mode, then use
option 02, 03, 04, 05 to set up IP address, Subnet Mask, Gateway and DNS server respectively.
F
IRMWARE SERVER IP ADDRESS: Select voice menu option 13 to configure the IP address of the firmware
server.
CONFIGURATION SERVER IP ADDRESS: Select voice menu option 14 to configure the IP address of the
configuration server.
U
PGRADE PROTOCOL: Select voice menu option 15 to choose firmware and configuration upgrade
protocol. User can choose between TFTP and HTTP.
F
IRMWARE UPGRADE MODE: Select voice menu option 17 to choose firmware upgrade mode among the
following three options:
PORT WEB ACCESS: Select voice menu option 12 to enable WAN Port Wed Access of the device
WAN
configuration pages.
1) always check, 2) check when pre/suffix changes, and 3) never upgrade
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CONFIGURING HT–502 WITH WEB BROWSER
HT–502 has an embedded Web server that will respond to HTTP GET/POST requests. It also has
embedded HTML pages that allow users to configure the HT–502 through a Web browser such as
Microsoft’s IE and AOL’s Netscape.
ACCESS THE WEB CONFIGURATION MENU
The HT–502 HTML configuration menu can be accessed via LAN or WAN port:
From the LAN port:
1. Directly connect a computer to the LAN port.
2. Open a command window on the computer
3. Type in “ipconfig /release”, the IP address etc. becomes 0.
4. Type in “ipconfig /renew”, the computer gets an IP address in 192.168.2.x segment by default
5. Open a web browser, type in the default gateway IP address.
login page of the device.
From the WAN port:
The WAN port HTML configuration option is disabled by default from factory. To access the HTML
configuration menu from the WAN port:
http://192.168.2.1. You will see the
1. Enable the “WAN Port Web Access” option via IVR option 12.
2. Find the WAN IP address of the HT–502 using voice prompt menu option 02.
3. Access the HT–502 Web Configuration page by the following URI via WAN port:
http://HandyTone-IP-Address (the HT IP-Address is the WAN IP address for the HT–502).
NOTE: If using a web browser to enter the configuration page, strip the leading “0”s because the browser
will parse in octet. (i.e. if the IP address is: 192.168.00
1.014, please type in: 192.168.1.14).
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E
ND USER CONFIGURATION
Once the HTTP request is entered and sent from a Web browser, the user will see a log-in screen. There
are two default passwords for the login page:
User Level: Password: Web pages allowed:
End User Level 123 Only Status and Basic Settings
Administrator Level admin Browse all pages
Only an administrator can access the “ADVANCED SETTING” configuration page.
F
IGURE 3: SCREENSHOT OF CONFIGURATION LOG- IN PAGE
NOTE: If you cannot log into the configuration page by using default password, please check with the
VoIP service provider. The service provider may have provisioned and configured the device for you. The
Basic Configuration Page is the first web GUI the user will see.
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TABLE 7: HT–502 BASIC CONFIGURATION SETTINGS DEFINITIONS
End User Password
Web Port
Telnet Server
IP Address
Time Zone
Self Defined Time
Zone
Language
Device Mode
Password to access the Web Configuration Menu. This field is case sensitive
with a maximum length of 25 characters.
By default, HTTP uses port 80. This field is for customizable web port.
Default is set to YES.
There are two modes to operate the HT–502:
DHCP mode: all the field values for the Static IP mode are not used (even
though they are still saved in the Flash memory.) The HT–502 acquires its IP
address from the first DHCP server it discovers from the LAN it is connected.
Using the PPPoE feature: set the PPPoE account settings. The HT–502 will
establish a PPPoE session if any of the PPPoE fields is set.
Static IP mode: configure the IP address, Subnet Mask, Default Router IP
address, DNS Server 1 (primary), DNS Server 2 (secondary) fields. These fields
are set to zero by default.
Controls how the date/time is displayed according to the specified time zone.
TBD
Languages supported with voice prompt
This parameter controls whether the device is working in NAT router mode or
Bridge mode. Save the setting and reboot prior to configuring HT–502 .
Reply to ICMP on
WAN port
WAN side
HTTP/Telnet
Access
Cloned WAN MAC
Addr
LAN Subnet Mask
LAN DHCP Base IP
DHCP IP Lease
Time
DMZ IP
Port Forwarding
If set to “Yes”, the HT–502 will respond to the PING command from other
computers, but it also is vulnerable to the DOS attack. Default is No.
If set to “Yes”, user can access the configuration page through the WAN port,
instead of through the “PC” port. Warning: this configuration is less secure than
default option. Default is No.
Enables a specific MAC address. Set in Hex format.
Sets the LAN subnet mask. Default value is 255.255.255.0
Base IP for the LAN port which functions as a Gateway for the subnet.
Default value is 192.168.2.1.
Value is set in units of hours. Default value is 120 hrs (5 Days.) The time IP
address is assigned to the LAN clients.
Forward all WAN IP traffic to a specific IP address if no matching port is used by
HT–502 or defined in port forwarding.
Forwards a matching (TCP/UDP) port to a specific LAN IP address with a
specific (TCP/UDP) port.
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In addition to the Basic Settings configuration page, end users also have access to the Device Status
page.
T
ABLE 8: HT–502 DEVICE STATUS PAGE DEFINITIONS
MAC Address
WAN IP Address
Product Model
Software Version
System Up Time
PPPoE Link Up
NAT
Port
The device ID in HEX format. This is needed for ISP troubleshooting.
Shows LAN IP address of HT–502.
Contains the product model info.
Program: This is the main software release. Boot and Loader are seldom
changed.
Shows system up time since the last reboot.
Indicates whether the PPPoE connection is up if the HT–496is connected
to DSL modem.
Indicates the type of NAT the HT–496 is connected to via its WAN port.
Based on STUN protocol.
Indicates whether the different FXS Ports are registered to the SIP
server(s).
ADVANCED USER CONFIGURATION
Log-in to the advanced user configuration page the same way as for the basic configuration page. The
password is case sensitive and the factory default password for Advanced User is “admin”.
Advanced User configuration includes the end user configuration and the advanced configurations
including: a) SIP configuration, b) Codec selection, c) NAT Traversal Setting and d) other miscellaneous
configuration. Following is a snap shot of the advanced configuration page.
F
IGURE 4: SCREENSHOT OF ADVANCED USER CONFIGURATION LOG- IN PAGE
Grandstream Device Configuration
Password
Login
All Rights Reserved Grandstream Networks, Inc. 2005-2006
Each FXS SIP account has its own configuration page. Their configurations are identical.
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TABLE 9: HT–502 ADVANCED CONFIGURATION PAGE DEFINITIONS
Admin Password
Layer 3 QoS
Layer 2 QoS
STUN Server
Keep-alive interval
Firmware Upgrade
and Provisioning
Via TFTP Server
This contains the password to access the Advanced Web Configuration page.
This field is case sensitive.
This field defines the layer 3 QoS parameter which can be the value used for IP
Precedence or Diff-Serv or MPLS. Default value is 48.
Value used for layer 2 VLAN tag. Default setting is blank.
IP address or Domain name of the STUN server.
This parameter specifies how often the HT–502 sends a blank UDP packet to
the SIP server in order to keep the “hole” on the NAT open. Default is 20
seconds. Minimum value is 20 seconds.
Enables HT–502 to download firmware or configuration file through either the
TFTP or HTTP server.
This is the IP address of the configured TFTP server. If selected and it is nonzero or not blank, the HT–502 retrieves the new configuration file or new code
image from the specified TFTP server at boot time. After 5 attempts, the
system will timeout and will start the boot process using the existing code
image in the Flash memory. If a TFTP server is configured and a new code
image is retrieved, the new downloaded image is saved into the Flash memory.
Note: Please do NOT interrupt the TFTP upgrade process (especially the
power supply) as this will damage the device. Depending on the network
environment this process can take up to 15 or 20 minutes.
Via HTTP Server
Firmware Server Path
Config Server Path
Firmware File Prefix
Firmware File Postfix
Config File Prefix
Config File Postfix
Automatic Upgrade
The URL for the HTTP server used for firmware upgrade and configuration via
HTTP.
For example, ttp://provisioning.mycompany.com:6688/Grandstream/1.0.0.36
“:6688” is the specific TCP port where the HTTP server is listening; it can be
omitted if using default port 80.
Note: If Auto Upgrade is set to No, HT–502 will only do HTTP download once
at boot up.
IP address or domain name of firmware server.
IP address or domain name of configuration server.
Default is blank. If configured, HT–502 will request firmware file with the prefix.
This setting is useful for ITSPs. End user should keep it blank.
Default is blank. End user should keep it blank.
Default is blank. End user should keep it blank.
Default is blank. End user should keep it blank.
Default is “NO”.
When set to No, HT–502 will only do upgrade once at boot up. “Check every
day “, ” Check every week”, “Always check for New Firmware at Boot up.” “
Check New Firmware only when F/W pre/suffix changes”
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Firmware Key
Authenticate Conf
File
Firmware Key
Lock Keypad Update
NTP server
Syslog Server
Syslog Level
Used for firmware encryption. Should be 32 digit in Hexadecimal
Representation. End user should keep it blank.
If set to Yes, config file is authenticated before acceptance. This protects the
configuration from an unauthorized change.
Used for firmware encryption. Should be 32 digit in Hexadecimal
Representation. End user should keep it blank.
If set to “Yes”, the configuration update via keypad is disabled.
URI or IP address of the NTP (Network Time Protocol) server. Used by the
phone to synchronize the date and time.
The IP address or URL of System log server. This feature is especially useful
for the ITSP (Internet Telephone Service Provider)
Select the HT–502 to report the log level. Default is NONE. The level is one of
DEBUG, INFO, WARNING or ERROR. Syslog messages are sent based on
the following events:
1. product model/version on boot up (INFO level)
2. NAT related info (INFO level)
3. sent or received SIP message (DEBUG level)
4. SIP message summary (INFO level)
5. inbound and outbound calls (INFO level)
6. registration status change (INFO level)
7. negotiated codec (INFO level)
8. Ethernet link up (INFO level)
9. SLIC chip exception (WARNING and ERROR levels)
10. memory exception (ERROR level)
The Syslog uses USER facility. In addition to standard Syslog payload, it
contains the following components:
GS_LOG: [device MAC address][error code] error message
Example: May 19 02:40:38 192.168.1.14 GS_LOG: [00:0b:82:00:a1:be][000]
Ethernet link is up
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TABLE 10: HT–502 INDIVIDUAL ACCOUNT SETTINGS DEFINITIONS
Profile Active
SIP Server
Outbound Proxy
SIP transport
NAT Traversal (STUN)
SIP User ID
Authenticate ID
When set to Yes the FXS port is activated.
SIP Server’s IP address or Domain name provided by VoIP service
provider.
IP address or Domain name of Outbound Proxy, or Media Gateway, or
Session Border Controller. Used by HT–502 for firewall or NAT
penetration in different network environments. If symmetric NAT is
detected, STUN will not work and ONLY outbound proxy can correct the
problem.
User can select UDP or TCP or TLS.
This parameter defines whether the HT–502 NAT traversal mechanism is
activated or not. If activated (by choosing “Yes”) and a STUN server is also
specified, then the HT–502 performs according to the STUN client
specification. Under this mode, the embedded STUN client will detect if and
what type of firewall/NAT is being used. If the detected NAT is a Full Cone,
Restricted Cone, or a Port-Restricted Cone, the HT–502 will use its
mapped public IP address and port in all of its SIP and SDP messages.
If the NAT Traversal field is set to “Yes” with no specified STUN server, the
HT–502 will periodically (every 20 seconds or so) send a blank UDP
packet (with no payload data) to the SIP server to keep the “hole” on the
NAT open.
User account information, provided by VoIP service provider (ITSP).
Usually in the form of digit similar to phone number or actually a phone
number.
SIP service subscriber’s Authenticate ID used for authentication. Can be
identical to or different from SIP User ID.
Authenticate Password
Name
Use DNS SRV
User ID is Phone
Number
SIP Registration
Unregister on Reboot
Outgoing Call w/o
Registration
Register Expiration
Local SIP port
Local RTP port
SIP service subscriber’s account password.
SIP service subscriber’s name for Caller ID display.
Default is No. If set to “Yes” the client will use DNS SRV to look up server.
If the HT–502 has an assigned PSTN telephone number, this field should
be set to “Yes”. Otherwise, set it to “No”.
If “Yes” is set, a “user=phone” parameter will be attached to the “From”
header in SIP request.
Controls whether the HT–502 needs to send REGISTER messages to the
proxy server. The default setting is Yes.
Default is No. If set to Yes, the SIP user’s registration information will be
cleared on reboot.
Default is No. If set to “Yes,” user can place outgoing calls even when not
registered (if allowed by ITSP) but is unable to receive incoming calls.
This parameter allows the user to specify the time frequency (in minutes)
the HT–502 refreshes its registration with the specified registrar. The
default interval is 60 minutes (or 1 hour). The maximum interval is 65535
minutes (about 45 days).
Defines the local SIP port the HT–502 will listen and transmit. The default
value for FXS port 1 is 5060. The default value for FXS port 2 is 5062.
Defines the local RTP-RTCP port pair the HT–502 will listen and transmit.
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It is the base RTP port for channel 0. When configured,
channel 0 uses this port _value for RTP and the port_value+1 for its
RTCP; channel 1 uses port_value+2 for RTP and port_value+3 for its
RTCP.
The default value for FXS port 1 is 5004. The default value for FXS port 2
is 5012.
Use Random Port
Refer to Use Target
Contact
DTMF Payload Type
DTMF in-audio
DTMF via RFC2833
DTMF via SIP INFO
Send Flash Event
Enable Call Features
Offhook Auto-Dial
Proxy-Require
Use NAT IP
Distinctive Ring Tone
Disable Call Waiting
Disable Call Waiting
Tone
Ring Timeout
No Key Entry Timeout
Early Dial
Dial Plan Prefix
This parameter forces the random generation of both the local SIP and
RTP ports when set to Yes. This is usually necessary when multiple HT–
502 are behind the same NAT.
Used for call transfer, incase server requires this setting.
Sets the payload type for DTMF using RFC2833.
Send DTMF as inband (in-audio).
Send DTMF via RTP (According to RFC 2833).
Send DTMF via SIP INFO message.
Default is No. If set to yes, flash will be sent as DTMF event.
Default is Yes. Advanced call features and feature codes functions are
supported locally.
This parameter allows users to configure a User ID or extension number to
be automatically dialed upon off-hook. Only the user part of a SIP address
needs is entered here. The HT–502 will automatically append the “@” and
the host portion of the corresponding SIP address.
SIP Extension to notify SIP server that the unit is behind the NAT/Firewall.
NAT IP address used in SIP/SDP message. Default is blank.
Custom Ring Tone 1 to 3 with associate Caller ID: when selected, if Caller
ID is configured, then the device will ONLY uses this ring tone when the
incoming call is from the Caller ID. System Ring Tone is used for all other
calls. When selected but no Caller ID is configured, the selected ring tone
will be used for all incoming calls.
Default is No.
Default is No.
Incoming call will stop ringing when not picked up given a specific period of
time.
Default is 4 seconds.
Default is No. Use only if proxy supports 484 response. This parameter
controls whether the phone will send an early INVITE each time a key is
pressed when a user dials a number. If set to “Yes”, an INVITE is sent
using the dial-number collected thus far; Otherwise, no INVITE is sent until
the “(Re-)Dial” button is pressed or after about 5 seconds have elapsed if
the user forgets to press the “Re-Dial” button. The “Yes” option should be
used ONLY if there is a SIP proxy configured and the proxy server supports
484 Incomplete Address response. Otherwise, the call will likely be
rejected by the proxy (with a 404 Not Found error).
This feature is NOT designed to work with and should NOT be enabled for
direct IP-to-IP calling.
Sets the prefix added to each dialed number.
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Use # as Dial Key
Subscribe for MWI
Send Anonymous
Special Feature
Preferred Vocoder
G723 Rate
iLBC Frame Size
iLBC Payload type
G726-16 Payload type
G726 - 24 Payload type
G726 - 32 Payload type
G726 - 40 Payload type
G729E payload type
VAD
Fax Mode
Jitter Buffer Type
Jitter Buffer Length
SLIC Setting
Caller ID Scheme
Polarity Reversal
Hook Flash Timing
Gain
Call Progress/ Ring
Tones
Allows users to configure the “#” key as the “Send” (or “Dial”) key. If set to
“Yes”, “#” will send the number. In this case, this key is essentially
equivalent to the “(Re)Dial” key. If set to “No”, this “#” key can be included
as part of number.
Default is No. When set to “Yes” a SUBSCRIBE for Message Waiting
Indication will be sent periodically.
If this parameter is set to “Yes”, the “From” header in outgoing INVITE
message will be set to anonymous, blocking Caller ID.
Default is Standard. Choose the selection to meet some special
requirements from Softswitch vendors.
The HT–502 supports up to 5 different Vocoder types including G.711 A/U-law, GSM, G.723.1, G.729A/B. The user can configure Vocoders in a
preference list that will be included with the same preference order in SDP
message. The first Vocoder is entered by choosing the appropriate option
in “Choice 1”. The last Vocoder is entered by choosing the appropriate
option in “Choice 8”.
Defines the encoding rate for G.723 vocoder. By default, 6.3kbps rate is
chosen.
Sets the iLBC frame size in 20ms or 30ms
Defines payload type for iLBC. Default value is 97. The valid range is
between 96 and 127.
Default value is 98. Range is from 96 to 127.
Default value is 99. Range is from 96 to 127.
Default value is 100. Range is from 96 to 127.
Default value is 103. Range is from 96 to 127.
Default value is 102. Range is from 96 to 127.
Default is No.
T.38 (Auto Detect) FoIP by default, or Pass-Through (must use codec
PCMU/PCMA)
Select either Fixed or Adaptive based on network conditions.
Select Low, Medium or High based on network conditions.
Dependent on standard phone type (and location)
• Bellcore/Telcordia
• ETSI-FSK
• ETSI-DTMF
• SIN 227 - BT
• NTT Japan
Default is No. If set to “Yes”, polarity will be reversed upon call
establishment and termination.
If the timing is shorter than “minimum”, it is considered Ignore.
If the timing is longer than “minimum” but shorter than “maximum”, it
is considered Flash.
If the timing is longer than “maximum”, it is considered Hand-up.
Handset volume adjustment. RX is for receiving volume, TX is for
transmission volume. Default values are 0dB for both parameters.
Loudest volume: +6dB Lowest volume: -6dB.
Configure ring or tone frequencies according to preference. By default
tones are set to North American frequencies. Frequencies should be
configured with known values to avoid uncomfortable high pitch sounds.
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S
AVING THE CONFIGURATION CHANGES
Click the “Update” button in the Configuration page to save the changes to the HT–502 configuration. The
following screen confirms that the changes are saved. Reboot or power cycle the HT–502 to enable the
changes.
FIGURE 5: SCREENSHOT OF SAVE CONFIGURATION PAGE
REBOOTING THE HT–502 FROM REMOTE
The HT–502 can be remotely reboot by clicking the “Reboot” button at the bottom of the configuration
page. When finished, re-login to the HT–502 after waiting about 30 seconds.
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SOFTWARE CONFIGURATION
Software upgrades are completed via TFTP or HTTP. The corresponding configuration settings are in the
ADVANCED SETTINGS configuration page.
FIRMWARE UPGRADE THROUGH TFTP/HTTP
Our latest official release can be downloaded from: http://www.grandstream.com/y-firmware.htm. To
upgrade your unit firmware, follow these steps:
1. Under Advanced Settings webpage, enter your TFTP or HTTP Server IP address (or FQDN) next
to the “Firmware Upgrade: Upgrade Server” field.
2. Select via TFTP or HTTP accordingly.
3. If you plan to use Automatic Upgrade, set it to “Yes”, otherwise No (this will make it check for
upgrade every time you reboot).
IVR
METHOD
Firmware server in IP address format can be configured via IVR. If firmware server is in FQDN format, it
must be set via web configuration interface.
U
PGRADE THROUGH HTTP
To upgrade firmware via HTTP, the field “Firmware Upgrade and Provisioning: Upgrade Via” needs to be
set to HTTP. The “Firmware Server Path” should be set to where the firmware files are located.
For example
6688/Grandstream/1.0.0.29 where firmware.mycompany.com is the FQDN of the HTTP server. It can
also be in IP address format. “:6688” is the TCP port the HTTP server listening to, default http server
listens to port 80. “/Grandstream/1.0.0.29” is the RELATIVE directory to the root dir on HTTP web server.
U
PGRADE THROUGH TFTP
To upgrade firmware via TFTP, set the field “Firmware Upgrade and Provisioning: Upgrade Via” to TFTP.
The TFTP server can be configured in either IP address format or FQDN. To configure the TFTP server
via the Web configuration interface, follow these five steps:
1. Open your browser to input the IP address of the HT–502 .
2. Enter the admin password to enter the configuration screen.
3. Enter the TFTP server address or URL in the “Firmware Server Path” field near the bottom of the
4. Once the “Firmware Server Path” is set, update the change by clicking the “Update” button.
5. Reboot or power cycle the unit.
If the configured updating server is found and a new code image is available, the HT–502 will retrieve the
new image files by downloading them into the HT–502 ’s SRAM. During this stage, the HT–502 ’s LED
will blink until the checking/downloading process is completed. Upon verification of checksum, the new
code image will be saved into the Flash. If TFTP fails for any reason (e.g., TFTP server is not
responding, there are no code image files available for upgrade, or checksum test fails, etc), the HT–502
will stop the TFTP process and simply boot using the existing code image in the flash.
A firmware upgrade may take as long as 20 minutes over the Internet, or 20+ seconds if performed on a
LAN. Grandstream recommends conducting firmware upgrades in a controlled LAN environment if
possible.
, the user can use the following URL in the Firmware Server Path:firmware.mycompany.com:
configuration screen.
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NO LOCAL TFTP SERVER
For users who do not have a local TFTP server, Grandstream provides a NAT-friendly TFTP server on
the public Internet for users to download the latest firmware upgrade automatically. Please check the
Services section of Grandstream’s Web site to obtain this TFTP server IP address. Alternatively, user
can download and install a free TFTP or HTTP server in his LAN for a firmware upgrade. A free
Windows version TFTP server can be downloaded from:
http://support.solarwinds.net/updates/New-customerFree.cfm.
TFTP Server Downloading Directions
1. Unzip the file and put all of the files under the root directory of the TFTP server.
2. Put the PC running the TFTP server and the HT–502 in the same LAN segment.
3. Go to File -> Configure -> Security to change the TFTP server's default setting from "Receive
Only" to "Transmit Only" for the firmware
4. Start the TFTP server, in the phone’s web configuration page.
5. Configure the Firmware Server Path with the IP address of the PC.
6. Update the change and reboot the unit.
:
upgrade.
You can also download the free HTTP server from
IRMWARE AND CONFIGURATION FILE PREFIX AND POSTFIX
F
Firmware Prefix and Postfix allows the device to download the firmware name with the matching Prefix
and Postfix. This makes it possible to store ALL firmware with different versions in a single directory.
Similarly, Config File Prefix and Postfix allows the device to download the configuration file with the
matching Prefix and Postfix, allowing multiple configuration files for the same device to be stored in one
directory.
In addition, when the field “Check New Firmware only when F/W pre/suffix changes” is set to “Yes”, the
device will only issue a firmware upgrade request if there are changes in the firmware Prefix or Postfix.
M
ANAGING FIRMWARE AND CONFIGURATION FILE DOWNLOAD
When “Automatic Upgrade” is set to “Yes”, Service Provider can use P193 (Auto Check Interval, in
minutes, default and minimum is 60 minutes) to have the devices periodically check with either Firmware
Server or Config Server, whenever they are defined. This allows the device periodically check if there are
any new changes need to be taken on a scheduled time. By defining different intervals in P193 for
different devices, Server Provider can spread the Firmware or Configuration File download in minutes to
reduce the Firmware or Provisioning Server load at any given time.
http://httpd.apache.org or use Microsoft IIS web.
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RESTORE FACTORY DEFAULT SETTING
WARNING! Restoring the Factory Default Setting will DELETE all configuration information of the phone.
Please BACKUP or PRINT out all the settings before you approach to following steps. Grandstream will
not take any responsibility if you lose all the parameters of setting and cannot connect to your VoIP
service provider.
FACTORY RESET
There are three (3) methods for resetting your unit:
Reset Button
Reset default factory settings following these four (4) steps:
1. Unplug the Ethernet cable.
2. Locate a needle-sized hole on the back panel of the HT–502 unit next to the power
connection.
3. Insert a pin in this hole, and press for about 7 seconds.
4. Take out the pin. Factory unit settings are restored.
MAC Address
Reset default factory settings by changing the MAC Address:
1.
Locate the MAC address of the device. It is the 12 digit HEX number on the bottom of the
unit.
2.
Key in the MAC address. Use the following mapping:
0-9: 0-9
a. A: 22 (press the “2” key twice, “A” will show on the LCD)
b.
B: 222
c. C: 2222
d. D: 33 (press the “3” key twice, “D” will show on the LCD)
e. E: 333
f. F: 3333
For example: if the MAC address is 000b
NOTE: If there are digits like “22” in the MAC, you need to type “2” then press “->” right arrow key to
move the cursor or wait for 4 seconds to continue to key in another “2”.
IVR Command
Reset default factory settings using the IVR Prompt (Table 5):
1. Dial “***” for voice prompt.
2. Enter “99” and wait for “reset” voice prompt.
3. Enter the MAC address (on bottom of unit)
4. Wait 15 seconds and device will automatically reboot and restore factory settings.
8200e395, it should be key in as “0002228200333395”.
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GLOSSARY OF TERMS
ADSL Asymmetric Digital Subscriber Line: Modems attached to twisted pair copper wiring that transmit
from 1.5 Mbps to 9 Mbps downstream (to the subscriber) and from 16 kbps to 800 kbps upstream,
depending on line distance.
AGC Automatic Gain Control is an
control the
real world conditions.
ARP Address Resolution Protocol is a protocol used by the
IPv4, to map
operates below the network layer as a part of the interface between the OSI network and OSI link layer. It
is used when
ATA Analogue Telephone Adapter. Covert analogue telephone to be used in data network for VoIP, like
Grandstream HT series products.
CODEC Abbreviation for Coder-Decoder. It's an analog-to-digital (A/D) and digital-to-analog (D/A)
converter for translating the signals from the outside world to digital, and back again.
CNG Comfort Noise Generator, generate artificial background
communications to fill the
DATAGRAM A data packet carrying its own address information so it can be independently routed from
its source to the destination computer
DECIMATE To discard portions of a signal in order to reduce the amount of information to be encoded or
compressed. Lossy compression algorithms ordinarily decimate while sub-sampling.
DECT Digital Enhanced Cordless Telecommunications: A standard developed by the European
Telecommunication Standard Institute from 1988, governing pan-European digital mobile telephony.
DECT covers wireless PBXs, telepoint, residential cordless telephones, wireless access to the public
switched telephone network, Closed User Groups (CUGs), Local Area Networks, and wireless local loop.
The DECT Common Interface radio standard is a multi-carrier time division multiple access, time division
duplex (MC-TDMA-TDD) radio transmission technique using ten radio frequency channels from 1880 to
1930 MHz, each divided into 24 time slots of 10ms, and twelve full-duplex accesses per carrier, for a total
of 120 possible combinations. A DECT base station (an RFP, Radio Fixed Part) can transmit all 12
possible accesses (time slots) simultaneously by using different frequencies or using only one frequency.
All signaling information is transmitted from the RFP within a multi-frame (16 frames). Voice signals are
digitally encoded into a 32 Kbit/s signal using Adaptive Differential Pulse Code Modulation.
DNS Short for Domain Name System (or Service or Server), an
names into IP addresses
DID Direct Inward Dialing. The ability for an outside caller to dial to a PBX extension without going
through an attendant or auto-attendant.
DSP Digital Signal Processor. A specialized CPU used for digital signal processing. Grandstream
products all have DSP chips built inside.
DTMF Dual Tone Multi Frequency. The standard tone-pairs used on telephone terminals for dialing
using in-band signaling. The standards define 16 tone-pairs (0-9, #, * and A-F) although most terminals
support only 12 of them (0-9, * and #).
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gain of a system in order to maintain some measure of performance over a changing range of
IP network addresses to the hardware addresses used by a data link protocol. The protocol
IPv4 is used over Ethernet
silent time in a transmission resulting from voice activity detection.
electronic system found in many types of devices. Its purpose is to
Internet Protocol (IP) [RFC826], specifically
noise used in radio and wireless
Internet service that translates domain
FQDN Fully Qualified Domain Name. A FQDN consists of a host and domain name, including top-level
domain. For example,
www.grandstream.com is a fully qualified domain name. www is the host,
Grandstream is the second-level domain, and and.com is the top level domain.
FXS Foreign eXchange Office. An FXS device can be an analog phone, answering machine, fax, or
anything that handles a call from the telephone company like AT&T. They should also operate the same
way when connected to an FXS interface.
• An FXS interface will accept calls from FXS or PSTN interfaces. All countries and regions have
their own standards.
• FXS is complimentary to FXS (and the PSTN).
FXS Foreign eXchange Station. An FXS device has hardware to generate the ring signal to the FXS
extension (usually an analog phone).
• An FXS device will allow any FXS device to operate as if it were connected to the phone
company. This makes your PBX the POTS+PSTN for the phone.
• The FXS Interface connects to FXS devices (by an FXS interface, of course).
DHCP The Dynamic Host Configuration Protocol (DHCP) is an Internet protocol for automating the
configuration of computers that use TCP/IP. DHCP can be used to automatically assign IP addresses, to
deliver TCP/IP stack configuration parameters such as the subnet mask and default router, and to provide
other configuration information such as the addresses for printer, time and news servers.
ECHO CANCELLATION Echo Cancellation is used in
telephony to describe the process of removing
echo from a voice communication in order to improve voice quality on a telephone call. In addition to
improving quality, this process improves
preventing echo from traveling across a
acoustic echo and hybrid echo.
contribute to echo generation in
Speech compression techniques and digital processing delay often
telephone networks.
bandwidth savings achieved through silence suppression by
network. There are two types of echo of relevance in telephony:
H.323 A suite of standards for multimedia conferences on traditional packet-switched networks.
HTTP Hyper Text Transfer Protocol; the World Wide Web protocol that performs the request and retrieve
functions of a server
IP Internet Protocol. A packet-based protocol for delivering data across networks.
IP-PBX IP-based Private Branch Exchange
IP Telephony (Internet Protocol telephony, also known as Voice over IP Telephony) A general term for
the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and
other forms of information that have traditionally been carried over the dedicated circuit-switched
connections of the public switched telephone network (PSTN). The basic steps involved in originating an
IP Telephony call are conversion of the analog voice signal to digital format and compression/translation
of the signal into Internet protocol (IP) packets for transmission over the Internet or other packet-switched
networks; the process is reversed at the receiving end. The terms IP Telephony and Internet Telephony
are often used to mean the same; however, they are not 100 per cent interchangeable, since Internet is
only a subcase of packet-switched networks. For users who have free or fixed-price Internet access, IP
Telephony software essentially provides free telephone calls anywhere in the world. However, the
challenge of IP Telephony is maintaining the quality of service expected by subscribers. Session border
controllers resolve this issue by providing quality assurance comparable to legacy telephone systems.
IVR IVR is a software application that accepts a combination of voice telephone input and touch-tone
keypad selection and provides appropriate responses in the form of voice, fax, callback, e-mail and
perhaps other media.
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MTU A Maximum Transmission Unit (MTU) is the largest size packet or frame, specified in octets (eight-
bit bytes), that can be sent in a packet- or frame-based network such as the Internet. The maximum for
Ethernet is 1500 byte.
NAT Network Address Translation
NTP Network Time Protocol, a protocol to exchange and synchronize time over networks The port used
is UDP 123 Grandstream products using NTP to get time from Internet
OBP/SBC Outbound Proxy or another name Session Border Controller. A device used in
VoIP networks.
OBP/SBCs are put into the signaling and media path between calling and called Caller. The OBP/SBC
acts as if it was the called VoIP phone and places a second call to the called Caller. The effect of this
behavior is that not only the signaling traffic, but also the media traffic (voice, video etc) crosses the
OBP/SBC. Without an OBP/SBC, the media traffic travels directly between the VoIP phones. Private
OBP/SBCs are used along with
firewalls to enable VoIP calls to and from a protected enterprise network.
Public VoIP service providers use OBP/SBCs to allow the use of VoIP protocols from private networks
internet connections using NAT.
with
PPPoE Point-to-Point Protocol over Ethernet is a network protocol for encapsulating PPP frames in
Ethernet frames. It is used mainly with cable modem and DSL services.
PSTN Public Switched Telephone Network. The phone service we use for every ordinary phone call, or
called POT (Plain Old Telephone), or circuit switched network.
RTCP Real-time Transport Control Protocol, defined in
RFC 3550, a sister protocol of the Real-time
Transport Protocol (RTP), It partners RTP in the delivery and packaging of multimedia data, but does not
transport any data itself. It is used periodically to transmit control packets to participants in a streaming
multimedia session. The primary function of RTCP is to provide feedback on the quality of service being
provided by RTP.
RTP Real-time Transport Protocol defines a standardized packet format for delivering audio and video
over the Internet. It was developed by the Audio-Video Transport Working Group of the
published in 1996 as
RFC 1889
IETF and first
SDP Session Description Protocol is a format for describing
has been published by the
IETF as RFC 2327.
streaming media initialization parameters. It
SIP Session Initiation Protocol, An IP telephony signaling protocol developed by the IETF (RFC3261).
SIP is a text-based protocol suitable for integrated voice-data applications. SIP is designed for voice
transmission and uses fewer resources and is considerably less complex than H.323. All Grandstream
products are SIP based
STUN Simple Traversal of UDP over NATs is a
network protocol allowing clients behind NAT (or multiple
NATs) to find out its public address, the type of NAT it is behind and the internet side port associated by
the NAT with a particular local port. This information is used to set up UDP communication between two
hosts that are both behind NAT routers. The protocol is defined in
RFC 3489. STUN will usually work well
with non-symmetric NAT routers.
TCP Transmission Control Protocol is one of the core protocols of the
Internet protocol suite. Using TCP,
applications on networked hosts can create connections to one another, over which they can exchange
data or
packets. The protocol guarantees reliable and in-order delivery of sender to receiver data.
TFTP Trivial File Transfer Protocol, is a very simple
basic form of
FTP; It uses UDP (port 69) as its transport protocol.
file transfer protocol, with the functionality of a very
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UDP User Datagram Protocol (UDP) is one of the core protocols of the Internet protocol suite. Using
UDP, programs on networked computers can send short messages known as
UDP does not provide the reliability and ordering guarantees that
order or go missing without notice. However, as a result, UDP is faster and more efficient for many
lightweight or time-sensitive purposes.
VAD Voice Activity Detection or Voice Activity Detector is an algorithm used in
wherein, the presence or absence of human speech is detected from the audio samples.
VLAN A virtual
on a single physical
VoIP Voice over the Internet. VoIP encompasses many protocols. All the protocols do some form of
signaling of call capabilities and transport of voice data from one point to another. e.g.: SIP, H.323, etc.
LAN, known as a VLAN, is a logically-independent network. Several VLANs can co-exist
switch. It is usually refer to the IEEE 802.1Q tagging protocol.
TCP does; datagrams may arrive out of
datagrams to one another.
speech processing
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