GreaTEL GT8 User Manual
GT8 User Manual
Release 2.3
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Welcome
Welcome to the GT8 VoIP Gateway User manual. This document covers features,
functionalities, and installation procedures for the GT8 series, and provides tested
configuration examples for our gateway users. After reading this book, you will learn more
about the gateway, get familiar with the installation process, and feel more comfortable in
using the software to perform all administrative activities.
Version:
Document Version: 2.3.
Applicable Software Version: 1.9.x Series.
Copyright:
© Copyright 2007 GED. All rights reserved.
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TABLE OF CONTENTS
PRODUCT INTRODUCTION.........................................................................................................................7
Overview ................................................................................................................................................... 7
Features ....................................................................................................................................................8
Hardware Platform...................................................................................................................................9
Physical...............................................................................................................................................9
System Specifications.......................................................................................................................10
PREPARATION FOR INSTALLATION.......................................................................................................11
Safety Check ..........................................................................................................................................11
Installation Environment........................................................................................................................11
Temperature/Humidity .....................................................................................................................11
Dust Control and Air Flow...............................................................................................................12
Interference and Lightening Hazard.................................................................................................12
Installing GT8...................................................................................................................................12
Inspecting GT8 and Its Accessories ...................................................................................................12
INSTALLATION..............................................................................................................................................14
Installing GT8 .........................................................................................................................................14
Connecting the Cables..........................................................................................................................14
Connecting the Ethernet Port............................................................................................................14
Connecting FXS Cable.....................................................................................................................16
Connecting FXO Cable ....................................................................................................................16
Connecting the Power Supply..............................................................................................................17
Final Checks after Installation..............................................................................................................17
FUNCTION DESCRIPTION .........................................................................................................................18
Registration.............................................................................................................................................18
Function Description of Most Used Buttons.......................................................................................19
System Configurations ..........................................................................................................................20
Software Version..............................................................................................................................21
Hardware Version.............................................................................................................................21
DSP Version.....................................................................................................................................21
RTP Port Min and Max ....................................................................................................................21
First Digit Timeout...........................................................................................................................21
Inter Digit Timeout...........................................................................................................................22
Critical Dgt Timeout.........................................................................................................................22
DTMF Mode.....................................................................................................................................22
Default Codec...................................................................................................................................22
Echo cancellation..............................................................................................................................23
Set up the Phone Numbers ..................................................................................................................23
Hardware ..........................................................................................................................................24
Prefix................................................................................................................................................24
FXS(1~4)/ FXO(1~4).......................................................................................................................24
MGCP Setting.........................................................................................................................................25
MGCP Port.......................................................................................................................................26
Call Agent.........................................................................................................................................26
Domain Name...................................................................................................................................27
Default Packages.............................................................................................................................. 27
Persistent Line Event........................................................................................................................27
Wildcard...........................................................................................................................................27
All Wildcard.....................................................................................................................................27
End-Of-Line Using...........................................................................................................................28
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Quarantine Default to Loop..............................................................................................................28
Default Package Don’t Send Name..................................................................................................28
Always Enable 1st Digit Timeout.....................................................................................................28
Onhook don’t Delete Connection.....................................................................................................28
Notify Instead of 401/402.................................................................................................................29
Using L Package Handle FXO .........................................................................................................29
Using Configured Digit Map............................................................................................................29
SIP Setting ..............................................................................................................................................29
SIP Port.............................................................................................. ...............................................30
SIP Proxy..........................................................................................................................................30
SIP Registrar.....................................................................................................................................30
Registration Expires(s)..................................................................................................................... 31
SIP Domain Name............................................................................................................................31
Authentication Mode........................................................................................................................31
User Name........................................................................................................................................31
Password...........................................................................................................................................31
Network Configuration...........................................................................................................................32
Hostname..........................................................................................................................................32
Gateway IP Address.........................................................................................................................33
DHCP ...............................................................................................................................................33
Ethernet IP Address..........................................................................................................................33
Subnet Mask.....................................................................................................................................33
Hardware Address ............................................................................................................................33
DNS..................................................................................................................................................33
DNS Primary Server.........................................................................................................................34
DNS Alternate Server.......................................................................................................................34
PPPoE...............................................................................................................................................34
Time Primary Server ........................................................................................................................34
Time Alternate Server ......................................................................................................................34
Timeout.............................................................................................................................................34
Interval.............................................................................................................................................. 34
Time Zone ........................................................................................................................................35
Supplementary Features ......................................................................................................................35
Setting up the Feature Keys..............................................................................................................35
Set up All Forward ...........................................................................................................................40
Set up Busy Forward........................................................................................................................41
Set up No Answer Forward..............................................................................................................41
Set up Fashion Ring..........................................................................................................................42
Set up Hotline.............................................................................................................. .....................42
Dialing Plan and Routing Table ...........................................................................................................43
Set up the Dialing Plan.....................................................................................................................43
Set up the Routing Table..................................................................................................................44
Set up the FXS Ports.............................................................................................................................51
Phone Number..................................................................................................................................52
Registration.......................................................................................................................................52
Display Name...................................................................................................................................53
Password...........................................................................................................................................53
Originating Restriction.....................................................................................................................53
Call Waiting field.............................................................................................................................53
Call Holding .....................................................................................................................................53
Call Forward.....................................................................................................................................53
Caller ID...........................................................................................................................................53
CID On Call Waiting........................................................................................................................54
Anonymous Call...............................................................................................................................54
Hotline..............................................................................................................................................54
Hotline Delay....................................................................................................................................54
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Do Not Disturb.................................................................................................................................54
Speed Dial ........................................................................................................................................54
Fashion Ring.....................................................................................................................................54
Reverse Battery.................................................................................................................................54
DDI Line...........................................................................................................................................55
Maintenance .....................................................................................................................................55
Call Control Reset ............................................................................................................................55
All Forward Number ......................................................................................................... ...............55
Busy Forward ...................................................................................................................................55
No answer Fwd Number...................................................................................................................55
Hotline Number................................................................................................................................55
Speed Dial List.................................................................................................................................56
Fashion Ring ID................................................................................................................................56
Set up the FXO.......................................................................................................................................56
Phone Number..................................................................................................................................57
Registration.......................................................................................................................................57
Display Name...................................................................................................................................57
Password...........................................................................................................................................57
Originating Restriction.....................................................................................................................58
Hotline..............................................................................................................................................58
Dialtone ............................................................................................................................................58
Echo Cancellation.............................................................................................................................58
Detect FSK ................................................................................. ......................................................58
Hotline Number................................................................................................................................58
Advanced Options .................................................................................................................................58
System Advanced Options................................................................................................................58
Advanced FXO Options ...................................................................................................................62
Advanced FXS Options....................................................................................................................64
Advanced IP Options........................................................................................................................66
Advanced SIP Options......................................................................................................................72
Backup Agent Config.......................................................................................................................75
Border Proxy Config ........................................................................................................................76
EMS Optional...................................................................................................................................78
Bill Optional.....................................................................................................................................78
Log Information ......................................................................................................................................81
Call Status Information.....................................................................................................................81
Resources Information......................................................................................................................82
Message Information........................................................................................................................82
Error Information..............................................................................................................................83
Startup Information........................................................................................................................... 83
Clear Message Information...............................................................................................................83
System Tools..........................................................................................................................................84
Restore Factory Setting ....................................................................................................................84
Software Update...............................................................................................................................84
Change Password..............................................................................................................................85
Restart Gateway................................................................................................................................86
Help ..................................................................................................................................................86
Exit ...........................................................................................................................................................86
APPENDIX......................................................................................................................................................87
Factory Default Settings........................................................................................................................87
Glossary ..................................................................................................................................................90
DHCP（Dynamic Host Configuration Protocol） ................................................................90
DSP（Digital Signal Processing） ..........................................................................................90
RTP（Real-Time Transport Protocol） ..................................................................................90
DTMF（Dual Tone Multi-Frequency） ....................................................................................91
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Speech CODEC ............................................................................................................................92
Echo Cancellation........................................................................................................................92
MGCP (Media Gateway Control Protocol) .............................................................................93
MGCP Call Agent .........................................................................................................................94
401/402 Response Code.............................................................................................................95
NTFY................................................................................................................................................95
SIP (Session Initiation Protocol)..............................................................................................95
Proxy.............................................................................................................................................100
Registrar.......................................................................................................................................100
Registration Expire(s)...............................................................................................................100
DNS (Domain Name System, or Service or Server）........................................................100
PPPoE（Point-to-Point Protocol Over Ethernet） ............................................................100
Time Server .................................................................................................................................101
Caller ID Detecting.....................................................................................................................101
SNMP (Simple Network Management Protocol) ................................................................101
UDP Port.......................................................................................................................................102
SNMP Trap...................................................................................................................................102
NAT（Network Address Translator or Translation） .......................................................102
SDP (Session Description Protocol).....................................................................................102
STUN（Simple Traversal of UDP over NATs） ..................................................................102
RADIUS（Remote Authentication Dial In User Service） ...............................................103
RADIUS Server ...........................................................................................................................103
Signal Gain ..................................................................................................................................103
Line Impedance..........................................................................................................................103
Signal Mode.................................................................................................................................104
Jitter Buffer .................................................................................................................................104
RTP Payload Type .....................................................................................................................104
SID ( Silence Information Description).................................................................................104
Voice Proxy .................................................................................................................................104
Symmetric RTP...........................................................................................................................105
Kernel............................................................................................................................................105
SDP（Session Description Protocol） ................................................................................105
G.723.1 Voice CODEC...............................................................................................................105
TOS (Type of Service)...............................................................................................................106
T.38 Standard Fax Protocol.....................................................................................................106
Redundancy Frame ...................................................................................................................106
V.21................................................................................................................................................106
NSF（Nonstandard facilities）...............................................................................................106
Request Line ...............................................................................................................................107
Via ..................................................................................................................................................107
Border Agent...............................................................................................................................107
RC4 Algorithm ............................................................................................................................107
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1
PRODUCT
INTRODUCTION
Overview
GT8 is a multi-purpose VoIP gateway product series designed with
the needs of service providers and enterprises in mind. With GT8
gateways, service providers can provide telephony and fax services
to subscribers using many access methods such as FTTB, HFC, and
ADSL. Enterprises can use the GT8’s traditional PBX interface to
implement voice VPN solutions with their private IP or public VPN
networks. GT8 can also serve as a remote SIP terminal for IP-PBX
solution.
GT8 has a variety of models. Each model can be customized to
have different number of FXS ports and FXO ports. It shares the
same software system as other GED’s VoIP products (GT48 and
GTT) and therefore keeps the advantages in functionality, quality,
and compatibility of GED products. In hardware GT8 uses Motorola’s
MPC852 as the Central Processing Unit, and TI C5509 high
efficiency chip to process voice and faxes. The powerful hardware
equipment ensures GT8 to send signaling and IP packets in different
channels even when traffic is at the peak, thus supports major
functions such as voice codec (G.711, G.729A, G.723.1, GSM and
iLBC) and echo cancellation.
This manual is mainly about GT8 installation and web configuration.
Please note that after you have made changes to many of the
parameters on GT8 Web Configuration page and clicked the Submit
button, you may get messages like “Submission is successful. Please
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PRODUCT INTRODUCTION
restart the system to make the changes effective.” You need to
restart GT8 using the instruction in Restart gateway.
GT8 also has the capability to restore the default settings. Just click
the Restore Default button.
GT8 configuration parameters have brief descriptions. To find out,
just point your mouse over the parameter.
Features
GT8 has the following features:
• It supports SIP/MGCP protocols
• It supports route selection (it can route a call or direct it to the
internet according to the called number)
• It supports RADIUS based CDR protocol
• It supports gain adjustment to FXS/FXO ports
• It supports the intrusion into NAT through a STUN server
• It supports traditional terminal devices, including phones, fax,
and PBX
• It supports a variety of supplementary services such as All
forward, Forward No Answer, Forward Busy Line, Call waiting,
and Distinctive Ring, etc.
• It can obtain static IP address or capture mobile IP address
through DHCP and PPPoE
• It supports the traditional fax service using T.30 and T.38
formats
• GT8 with FXO ports
• It supports the following sinaling protocols:
• SIP (Compliant to RFC 3261 and TISPAN)
• MGCP
• It supports the following codec:
• G.711
• G.723.1
• G.729A
• GSM
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• iLBC
• G.168 Echo Cancellation
• DTMF RFC2833 and T.38
Hardware Platform
Physical
PRODUCT INTRODUCTION
Figure 0-1 GT8 Front View
① Reset button (RST)
② Power indicator (PWR). If lit, power is on
③
④
Ethernet port indicator. If lit, it is in operation
FXS/FXO indicators. The port number is lit
when in use
Figure 0-2 GT8 Rear View
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PRODUCT INTRODUCTION
Power plug-in
10/100 baseT Ethernet port
FXS/FXO ports, a total of 8
RJ11 Port Configuration
Model
Number
①
②
③
Table 0-1 GT8 Configuration Options
1 2 3 4 5 6 7 8
GT8-4S FXS1 FXS2 FXS3 FXS4 Null Null Null Null
GT8-8S FXS1 FXS1 FXS3 FXS4 FXS5 FXS6 FXS7 FXS8
GT8-/4 FXO1 FXO2 FXO3 FXO4 Null Null Null Null
GT8-4S/4 FXS1 FXS2 FXS3 FXS4 FXO1 FXO2 FXO3 FXO4
System Specifications
Table 0-2 GT8 Specification
Internal Memory 32MB
Flash Memory 4MB
On-hook Battery -56V
Off-hook Battery -24V
Ringing Voltage 60V
REN Equivalence
Loop Current = or > 21 mA
Loop Resistance Up to 188 Ω
Surge Voltage
Max Line Length 1500 m
Off-hook Detection Loop Start
Dialing DTMF
Input Voltage 12V DC
Input Current 1.5Amp (Max)
Power Consumption 15Watt (Max)
Operation Temperature 0 ~ 40°C
Non Operation
Temperature
Operation Humidity 5 ~ 95% (Non Condensed)
Dimension (H×L×W) 300x190x45 mm
Weight 800g
Specification
5 for short loop ( 1000 feet), 3 for long loop (5000
feet)
Level two surge protection. Can stand up to 1000V
(10/100uS) power surge
–25 ~ 70°C
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PREPARATION FOR
INSTALLATION
To avoid any body injury and device damage, please read this
chapter carefully before the installation.
Safety Check
2
Please follow the safety guidelines when installing GT8.
• Keep away from wet group and heat
• Ensure safe use of electricity
• Ensure to connect all the interface cables correctly
Installation Environment
Temperature/Humidity
The GT8 installation room must maintain normal temperature and
humidity.
If the room temperature exceeds the specified maximum temperature,
it will shorten the live of the electrical insulation material. If the room
humidity exceeds the specified humidity, GT8 may experience
electrical static shock and shrinkage of electric insulation material in
the metal package. It may also cause metal corrosion. All these will
drastically shorten the life span of the GT8. It is strongly
recommended that user control the environmental temperature
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Preparation for Installation
between 0 ~ 40ºC and humidity between 5% ~ 95% (none
condensing).
Dust Control and Air Flow
Dust falls on the GT8 might cause intermittent failure in electrical
connections. It may cause long term damage to GT8 will cause
equipment failure and shorten equipment life span. Therefore, GT8
needs to have ample air flow in front of the GT8 air intake and
outtake for proper heat exhaust.
Interference and Lightening Hazard
GT8 may experience various types of EMI hazards in operation and
its performance may be impacted. To reduce those hazards, it is
suggested that：
• Do not install GT8 close to high power wireless equipment,
RADAR transmission site, and high frequency high electric
current devices.
• GT8 comes with Level 2 lightening protection. Its operation site
requires Level 1 lightening protection.
• GT8 must have its own power source and should be electrical
interference free
• Ensure proper grounding
Installing GT8
When installing the GT8 please make sure GT8 is secured and has
ample space for air flow.
Inspecting GT8 and Its Accessories
After the installation preparation is completed, the shipping package
can be opened to examine all the items in the package. The list of
items for the GT8 is shown in Table 2 - 1.
Table 0-1 GT8 Basic Configuration and Accessories
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Model Number Qty Description
Preparation for Installation
GT8-4S,GT8-8S,
GT8-/4, GT8-4S/4
1 Each GT8 may have 4 FXS ports, or 8
FXS ports, or 4 FXO ports, or 4
FXS/FXO ports. You need to examine
carefully to make sure what you receive
is what you paid for
MX-PWR10-V01-00 1 GT8 DC adaptor 12V 1.5A
MX-CBL00-0005 1 5 meter Ethernet cable, 1.5m in length
MX-CBL00-0011 1 GT8 power cord
Note：It is suggested that users carefully examine the content of
the shipping package according to the sales contract. If there is any
question or problem, please contact our customer service department.
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INSTALLATION
Installing GT8
Since GT8 is small, you can put it to a clean and flat workspace.
Please make sure it is secured and has ample space for air flow.
Connecting the Cables
3
Connecting the Ethernet Port
GT8 has one 10/100 Base-T Ethernet port with RJ45 connector. It is
equipped with LED status display. Besides voice packet, this port can
also manage, maintain, and control the information flow.
The Ethernet Cable needs to be carefully made to ensure IP data
and voice quality. The following is the Ethernet cable making
scheme:
Step1： A user can use a proper cable peeling cutter to peel away
3cm skin of a CAT-5 cable. What is left is shown in Figure 3-
1.
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Installation
Figure 0-1
Step2： Twisted pairs. Currently, the most commonly used standard
wiring scheme is EIA/TIA T568B shown in Figure 3-2. In the
wiring scheme, pin 1 and 2 are a pair, pin 3 and 6 are a pair,
pin 4 and 5 are a pair and pin 7 and 8 are a pair. According
to the Figure 3-2, twisted pairs line up with colors (1: white
orange，2: orange，3: white green，4:blue，5: white blue，
6:green，7: white brown，8: brown). It is specially noted that
the green and white green are separated by a pair of blue
wires. It is a common mistake to put green and white green
close together, which will result in interference and therefore
lower transmission efficiency.
Figure 0-2 T568B wire pairing scheme
Step3： After lining up wires to the correct pin positions, trim all the
twisted pairs with a cable cutter, leaving 15mm leads
exposed. Then follow Figure 3-3 by inserting wires to their
corresponding pin position in the plastic shell of RJ45
connector. Pin 1 will house white orange wire, etc.
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Installation
Figure 0-3 RJ 45 Wiring
Step4： After wires have been properly inserted into RJ45 connector;
a cramping tool can secure the wires to the connector and
make connections to the metal pins as shown in Figure 3-4.
Figure 0-4 Finished RJ 45
Since this is a direct connection, the connector for the other end of
the cable can be made the same way using RJ45 connector.
After the Ethernet cable is ready, Connect one end of the cable to
GT8’s WAN port and the other end to a switch or router. Check the
Ethernet status display: light or flash means activity.
Connecting FXS Cable
GT8 have FXS ports that connect to phones.
Connect one end of the RJ11 cable to the GT8 FXS port, and
connect the other end to a phone, fax, or PBX.
Connecting FXO Cable
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Installation
Certain GT8 products, like GT8-4 or GT8-4S/4, have FXO ports that
connect to PBX or PSTN.
Connect one end of the RJ11 cable to the GT8 FXO port, and
connect the other end to a PBX or PSTN line.
Connecting the Power Supply
Before plugging GT8 into the power outlet, it is suggested that triphase power outlet be used and grounding be properly connected.
Please follow the procedure when connecting to the power source：
Step1： Plug the DC head of the power adaptor into GT8’s DC input
socket.
Step2： Plug the AC head of the power adaptor into the power outlet
of 110V or 220V.
Step3： Check to see if the PWR LED indicator is lit. If PWR LED is lit,
everything is normal. If not, repeat Steps 1 to 2.
Note: If power up fails repeatedly, please contact GED technical
support. Do not attempt to open GT8 to fix any problems.
Final Checks after Installation
After installing GT8 and before it is powered on, please make sure of
the following:
• There is ample air space around GT8 for heat exhaustion.
• Power cord is standard and matches the required electric
voltage.
• Make sure the ports are connected to the right devices.
Note：It is very important to recheck all the installation work to
ensure GT8 to function properly and trouble free.
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FUNCTION
DESCRIPTION
Registration
4
Step1： Power up the GT8. GT8 by default uses DHCP, and will
automatically detect an IP address; if you cannot get the IP
address (when you connect to the computer directly), use
default IP address “192.168.2.218”. After power up (when
customer line LCD stops flashing), if the gateway uses
MGCP protocol，it will tell the IP address to any first off-hook
user; if using SIP protocol, you can press “##” to get the IP
address through any customer line at any time.
Step2： Double click
connected to the same network as GT8.
Step3： Type in GT8 IP address（for example：192.168.2.218）
as shown in Figure 4-1.
to open IE Explorer in the computer which is
，and the web interface will display
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Function Description
Figure 0-1 VoIP Gateway System Configurations Interface
GT8 has two levels of management：the administrator level (default
password：GTadmin) and the operator level (default password：
operator). Administrator level has higher access privilege, and is
allowed to change password for all users at all levels. Operator level
has lower access privilege, and certain options are not available
including network configurations, password management and restore
factory default settings.
GT8 allows multiple users to log on at the same time. Only the first
user logged on with highest privilege is able to change configurations.
The rest can only monitor configurations.
Note1：After a user logs on, he/she will be automatically logged
off if there is no activities for more than 10 minutes. After that, a user
needs to log on again.
Note2：After complete configuration, a user must completely log
out instead of just closing the browser. This will elevate the access
level of the next logged on user so he/she will be able to change the
configurations.
Function Description of Most Used
Buttons
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Function Description
At the bottom of each configuration page you will see two buttons:
Submit and Default.
• Submit: When you are done with configuration, click this button
once so that the configuration can be saved. After each
submission, you will be prompted by “Submission is successful.
Please restart the gateway!” You need to click OK to confirm the
action.
• Default: Click the button once to restore the factory default
setting for each parameter.
Note: Clicking this button only restore the defaults settings for the
current page. It is different from System Tools -> Restore Factory
Default in that the latter restore the default settings for the whole
system.
When the restoration is successful, you will be prompted by “The
settings are successfully restored. Please restart the gateway!” You
need to click OK to confirm the action.
System Configurations
Click System Configuration link on the left of Figure 4-1, and you will
see what is shown in Figure 4-2.
Figure 0-2 System Configuration Interface
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Function Description
Software Version
The Software Version field value is automatically detected. You do
not need to change this field.
Hardware Version
The Hardware Version field value is automatically detected. You do
not need to change this field.
DSP Version
The DSP Version field value is automatically detected. You do not
need to change this field.
RTP Port Min and Max
In the RTP Port Min field enter the minimum value of sending and
receiving RTP port.
you enter a value that is greater than 10000.
In the RTP Port Max field enter the maximum value of sending and
receiving RTP port.
you enter a value that equals “2 x number of lines + the minimum
value”.
Note: A VoIP call uses two RTP ports: one for RTP and the other
for RTCP. If GT8 has four lines (FXS) then the RTP port is set to
eight ports at least. If RTP has less than eight ports, four lines can
not be used at the same time. GT8 supports up to 8 FXS. So it is
highly recommended you set RTP to 16 ports. The default minimum
value is 10010～10030. You do not need to change it.
This is a required field. It is recommended that
This is a required field. It is recommended that
First Digit Timeout
In the First Digit Timeout field enter the time (in second) allowed for
the dialing of the first digit. When a line goes off-hook, if within the
time specified here the first digit has not been dialed, GT8 will treat
this as an abandoned call and will indicate to the caller to place the
phone on hook. The default value is 12 seconds.
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Function Description
Inter Digit Timeout
In the Inter Digit Timeout field enter the time (in second) allowed for
the dialing of the middle digits. Counting from the last digit dialed, if
within the time specified here no digit has been dialed, the system
will send the dialed digits out. The default value is 12 second.
Critical Dgt Timeout
In the Critical Dgt Timeout field enter the time (in second) for
finished dialing.
This parameter is used in conjunction with x.T in
the dialing rule. After the first digit in the rule has been dialed, if within
the time specified here no digit follows, GT8 will send the dialed
number out. The default value is 5 seconds.
DTMF Mode
In the DTMF
1
Mode field select the transmission mode. This
parameter is used to set DTMF signal transmission mode. Options
are Audio mode, 2833 mode, and INFO mode. The default setting is
Audio mode.
a) Audio mode is a transparent transmit mode;
b) INFO mode is information transmit mode;
c) 2833 mode is a RTP data packet transmit mode.
Default Codec
In the Default codec2 field select the codec GT8 supports. GT8
support G729A/20, G723/30, PCMU/20, PCMA/20, GSM, iLBC codec
1
DTMF（Dual Tone Multi-Frequency）
In PSTN service, after a call is connected, user’s touch tone info is transmitted via DTMF, also known as
second dial tone information. It is widely used in intelligent network and value-added services.
• Audio: Voice data transparent transmit mode.
• 2833: A special RTP packet. PT field of the header indicates this is a DTMF packet. See FTC 2833 for
details.
• INFO: Optional way of DTMF transmission. As in SIP messages, use INFO to indicate a DTMF signal.
2
Voice CODEC
Also called a "voice codec" or "vocoder," it is a hardware circuit that converts the spoken word into digital
code and vice versa. It comprises the A/D and D/A conversion and compression technique. If music is
encoded with a speech codec, it will not sound as good when decoded at the other end. A speech codec is an
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Function Description
as well as manifold encoding modes at the same time. Multiple
values are demarked by commas. When manifold encoding mode is
selected, the gateway will process the communication by selecting
the encoding mode front to back, which is supported by both sides.
Table 0-1 Codes supported
Codec supported
by GT8
G729A/20 G.729A 20
G723/30 G.723 30
PCMU/20 G.711 20
PCMA/20 G.711 20
iLBC/30 iLBC 30
GSM/20 GSM 20
Codec mode
Time interval of RTP packets
transmission(unit: ms)
Echo cancellation
In the Echo cancellation3 select on to invoke echo cancellation and
off to close echo cancellation. The manufacturer’s default is on. You
do not need to change it.
Set up the Phone Numbers
Click Phone Number link on the left of Figure 4-1, and you will see
what is shown in Figure 4-3:
audio codec designed for human voice. By analyzing vocal tract sounds, a recipe for rebuilding the sound at
the other end is sent rather than the soundwaves themselves. The speech codec is able to achieve a much
higher compression ratio, which results in a smaller amount of digital data for transmission. When telephones
were first digitized in the early 1960s, they generated digital streams of 64 Kbps. Since then, speech
CODECS have reduced voice to as little as 5 Kbps and less.
3
Echo Cancellation
The term 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 bandwidth savings achieved through silence suppression by preventing echo from traveling
across a network.
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Figure 0-3 Phone Number setting screen
Hardware
Function Description
Leave the Hardware Settings field as it is. GT8 has more than one
model, and the model number is set through the software. This
parameter is already predefined by the manufacturer. You do not
need to change it.
Prefix
In the Prefix field enter a prefix number which is for fast setting for
serial number. You can leave it blank from FXS2 to FXO4. When
FXS1 uses this prefix number, FXS2 uses FXS1 number plus 1, and
so on and so forth.
When you set GT8 to MGCP gateway, the value of the prefix should
be set to aaln/0 or aaln/1. If MGCP call agent starts from “0”, then
use aaln/0; if MGCP call agent starts from”1”, then use aaln/1.
When you set GT8 to SIP gateway, the value of the prefix should be
the first number of the serial phone number which the registry server
assigns to the gateway. For example if the number of gateway is
2002007, then 200 should be entered in the Prefix field.
FXS(1~4)/ FXO(1~4)
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Function Description
For the FXS lines, when the number is not a serial number or a serial
number that is not incrementing at order, you can manually enter the
number for each FXS line. This gives user more flexibility.
Under MGCP mode
You can set the phone numbers either like shown in Figure 4-4a or in
Figure 4-4b：
Figure 0-4 a Figure 0-4 b
Under the SIP mode
You can set the phone numbers either like shown in Figure 4-5a or in
Figure 4-5b：
Figure 0-5a Figure 0-5 b
MGCP Setting
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Function Description
Click the MGCP Config link on the left of Figure 4-1. You will see
Figure 4-6.
Figure 0-6 MGCP setting screen
MGCP Port
In the MGCP Port field enter GT8 gateway MGCP port number
(example: 2427). You can use any port number as long as it is not
the same as other port numbers.
Call Agent
In the Call Agent4 field enter the call agent address and port number.
Address and port number should be separated by :. Address could
4
Call Agent
Call Agent, also known as Media Gateway Controller, controls the Media Gateway. In MGCP, a call agent
primarily handles all the call processing by linking with the IP network through constant communications
with an IP signaling device, for example an SIP Server or an H.323 gatekeeper.
Call Agent is comprised of the call control "intelligence" and a media gateway boasting the media functions,
for example conversion from TDM voice to Voice over IP.
Media Gateways feature endpoints for the Call Agent to create and manage media sessions with other
multimedia endpoints. Endpoints are sources and/or sinks of data that can be physical or virtual. For creating
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Function Description
be IP address or domain name. If you use domain name, you should
invoke DNS service and set parameter of DNS server in the Network
Config page. A complete sample configuration is like this:
202.202.2.202:2727; callagent.com:2727.
Domain Name
In the Domain Name field enter the internet address or the IP
address.
Default Packages
In the Default Packages field enter all default packages. Use comma
to separate each package. The default setting is L,D,G, which means
Line Package, DTMF Package, and Generic Media Package.
Persistent Line Event
In the Persistent Line Event field enter all types of persistent line
event. Use comma to separate each line event. The gateway will
report to call agent when it handles an event. The default setting is
L/HD, L/HU, and L/HF. L/HD means off-hook; L/HU means on-hook;
and L/HF means hookflash.
Wildcard
In the Wildcard field select yes or no to indicate if GT8 will put the
fixed prefix when it registers (such as ：aaln/*).
All Wildcard
physical endpoints, hardware installation is needed while virtual endpoint can be created using available
software.
Call Agents come with the capability of creating new connections, or modify an existing connection.
Generally, a media gateway is a network element which provides conversion between the data packets carried
over the Internet or other packet networks and the voice signals carried by telephone lines. The Call Agent
provides instructions to the endpoints to check for any events and - if there is any - create signals. The
endpoints are designed in such a way as to automatically communicate changes in service state to the Call
Agent. The Call Agent can audit endpoints and the connections on endpoints.
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Function Description
In the All Wildcard field select yes or no to indicate if GT8 will put
the fixed prefix when it registers (such as ：*). If Wildcard and All
Wildcard are yes, the gateway will deal with all wildcard.
End-Of-Line Using
In the End-Of-Line Using CR field select yes or no to indicate if GT8
will use CR as line stop symbol when sending messages. If set to no,
CRLF will be used.
Quarantine Default to Loop
In the Quarantine Default to Loop field select yes or no to indicate
how GT8 will handle events when there is no response for
requirements. If set to yes, gateway will report continuously all
events of this requirements when it receive a requirement; if set to no,
gateway will response only once for each requirement.
Default Package Don’t Send Name
In the Default Package Don’t Send Name field select yes or no. If
set to yes, the gateway will reply to the default package without a
package name; if set to no it will reply to the default package with a
package name.
Always Enable 1st Digit Timeout
In the Always Enable 1st Digit Timeout field select yes or no to
indicate how GT8 will handle events when there is no timeout during
the required time. If set to yes, the gateway will report timeout
according to the settings when the caller does not dial a phone
number after going off-hook.
Onhook don’t Delete Connection
In the Onhook don’t Delete Connection field select yes or no. If
you select yes, the gateway will delete the connection when the
caller does not go on-hook; if you select no the gateway will wait for
the call agent to delete the connection.
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Function Description
Notify Instead of 401/402
In the Notify Instead of 401/4025 select yes or no. If you select yes,
the gateway will use notification message instead of 401/402
message.
Using L Package Handle FXO
In the Using L Package Handle FXO field select yes or no. If you
select yes, the gateway will treat FXO as FXS; if you select no, it will
handle FXO and FXS in different ways.
Using Configured Digit Map
In the Using Configured Digit Map field select yes or no. If you
select yes, the gateway will invoke the dialing rule; if you select no, it
will use the rule of soft-switch.
SIP Setting
Click the SIP6 link on the left of Figure 4-1，and the SIP Settings
screen displays.
5
401/402: Response Code.
6
SIP (Session Initiation Protocol)
Session Initiation Protocol (SIP) is the Internet Engineering Task Force's (IETF's) standard for multimedia
conferencing over IP. SIP is an ASCII-based, application-layer control protocol (defined in RFC 2543) that
can be used to establish, maintain, and terminate calls between two or more end points.
Like other VoIP protocols, SIP is designed to address the functions of signaling and session management
within a packet telephony network. Signaling allows call information to be carried across network boundaries.
Session management provides the ability to control the attributes of an end-to-end call.
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Function Description
Figure 0-7 SIP settings screen
SIP Port
In the SIP Port field enter the number of SIP local port. The default
value is 5060. Local port number could be set at will, as long as it
doesn’t conflict with the other port numbers in the system.
SIP Proxy
In the SIP Proxy field enter the address and port number of the
Proxy. The address and port number is separated by a colon. The
address can be in either IP address form or domain name form.
When adopting domain name form, it is necessary to invoke DNS
service in the “Network Setting” page and set the parameter of DNS
server. The complete and valid setting is as following:
201.30.170.38:5060 and softswitch.com:5060.
SIP Registrar
In the SIP Registrar7 field enter the address and port number of the
SIP Registrar The address and port number are separated by a colon.
Like other VoIP protocols, SIP is designed to address the functions of signaling and session management
within a packet telephony network. Signaling allows call information to be carried across network boundaries.
Session management provides the ability to control the attributes of an end-to-end call.
7
Registrar
When a client powers on, it will tell network its IP address in order to be found. We call this procedure
“register”. The server that accepts this request is called “registrar”.
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