2N VoiceBlue Next User Manual v3.1
www.2n.czFirmware
Version
2N VoiceBlue Next
®
User Manual
3.1
01.00.04
The 2N TELEKOMUNIKACE joint-stock company is a Czech manufacturer and supplier of
telecommunications equipment.
The product family developed by 2N TELEKOMUNIKACE a.s. includes GSM gateways, private
branch exchanges (PBX), and door and lift communicators. 2N TELEKOMUNIKACE a.s. has
been ranked among the Czech top companies for years and represented a symbol of stability
and prosperity on the telecommunications market for almost two decades. At present, we
export our products into over 120 countries worldwide and have exclusive distributors on all
continents.
2N is a registered trademark of 2N TELEKOMUNIKACE a.s.. Any product and/or other
®
names mentioned herein are registered trademarks and/or trademarks or brands protected
by law.
2N TELEKOMUNIKACE administers the FAQ database to help you quickly find information and
to answer your questions about 2N products and services. On www.faq.2n.cz you can find
information regarding products adjustment and instructions for optimum use and procedures
„What to do if...“.
Declaration of Conformity
2N TELEKOMUNIKACE hereby declares that the 2N VoiceBlue product complies with all
®
basic requirements and other relevant provisions of the 1999/5/EC directive. For the full
wording of the Declaration of Conformity see the CD-ROM enclosed and at www.2n.cz.
The 2N TELEKOMUNIKACE company is the holder of the ISO 9001:2009 certificate. All
development, production and distribution processes of the company are managed by this
standard and guarantee a high quality, technical level and professional aspect of all our
Content
1. Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3 Firmware Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.4 Terms and Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2. Description and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2 Factory Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.3 Brief Installation Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.4 IP Voice Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.5 VoiceBlue Next Connection to VoIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3. VoiceBlue Next Configuration . . . . . . . . . . . . . . . . . . . . . . . . 29
3.1 Factory Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.2 Basic Configuration – Step by Step . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.3 Call Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.4 Web Configuration Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4. Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
4.1 Terminal-Based Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
4.2 AT Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
4.3 LOGs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
4.4 CDR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
4.5 Available Status Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
4.6 Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
4.7 Tracing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
4.8 External SMS Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
5. Technical Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
6. Supplementary Information . . . . . . . . . . . . . . . . . . . . . . . . . . 86
6.1 Regulations and Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
6.2 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
6.3 List of Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
6.4 General Instructions and Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
1. Product Overview
In this section, we introduce the product, outline its application2N VoiceBlue Next
®
options and highlight the advantages following from its use. This section also includes
safety instructions.
Here is what you can find in this section:
1.1 Product Description
1.2 Safety Precautions
1.3 Firmware Upgrade
1.4 Terms and Symbols Used
®
42N TELEKOMUNIKACE a.s., www.2n.cz
1.1 Product Description
2N VoiceBlue Next® is a device that helps directly interconnect a SIP–supporting
VoIP network with GSM networks and can be used for direct connection with a
telephone set. The voice mode, i.e. outgoing and incoming calls, is the basic function of
the gateway. is equipped with all voice mode functions and 2N VoiceBlue Next
®
provides the highest user comfort. In addition to voice transmission, 2N VoiceBlue
®
enables you to send and receive text messages (SMS). No additional equipmentNext
(such as an external phone) is needed for normal operation. You can use the web
interface or AT commands for all the gateway settings. The programmable parameters
are set in such a way that you can make calls the moment you connect the system to
the Ethernet, connect an antenna and insert the SIM card. can 2N VoiceBlue Next
®
be combined with the service (remote GSM extension) for up 2N Mobility Extension
®
to 8 users . also provides connection to the syst
1
2N VoiceBlue Next
®
2N SIM Star
®
em .
2
2N VoiceBlue Next Basic Features
®
Compact size
Two/four GSM/UMTS channels
2
System rack installation option
2
Intelligent incoming/outgoing call routing
SMS sending/receiving (web, AT interfaces)
User–friendly web interface
Power over Ethernet (PoE)
A single antenna for 1 or 2 GSM modules
Automatic call records and detailed statistics
2N Mobility Extension® support
2N SIM® supportStar
Possibility of SMS sending+receiving via web interface
Tone detection
[1]
Depending on the available licence type
[2]
Depending on the part number
®
52N TELEKOMUNIKACE a.s., www.2n.cz
1.2 Safety Precautions
It is prohibited to use any transmitters, including the UMTS/GSM devices, in
areas where explosives are used, such as quarries.
It is prohibited to use the GSM gateways at petrol stations where mobile
telephones are also prohibited.
GSM phones may affect sensitive life–saving devices in medical centres.
Therefore, it is forbidden to use GSM/UMTS devices, including the GSM gateways,
in such facilities.
In general, any prohibition regarding mobile phones based on RF energy
radiation applies to GSM/UMTS devices too.
If necessary, the GSM gateways may be installed at a safe distance from the
prohibited area and connected with the original place through an Ethernet cable.
Although GSM gateways are not intended for cars or aeroplanes, all relevant
prohibitions and regulations regarding mobile phones apply to them too.
®
62N TELEKOMUNIKACE a.s., www.2n.cz
1.3 Firmware Upgrade
The manufacturer reserves the right to modify the product in order to improve its
qualities.
In response to the customers' requirements, the manufacturer constantly improves the
software contained in the product (firmware). For the latest firm2N VoiceBlue Next
®
ware version and the User Manual refer to the .2N web sites
For a detailed description of the firmware upgrade see the2N VoiceBlue Next
®
section devoted to the system installation.
Manual
Version
Upgrade
1.1
The User Manual relates to the firmware2N VoiceBlue Next
®
version 01.00.02.
2.0
The User Manual relates to the firmware 2N VoiceBlue Next
®
version 01.00.04.
3.0
New four–channel version.2N VoiceBlue Next
®
®
72N TELEKOMUNIKACE a.s., www.2n.cz
1.4 Terms and Symbols Used
Symbols in Manual
Safely Warning
Always abide by this information to prevent injury of persons.
Warning
Always abide by this information to prevent damage to the
device.
Cauting
for system functionality.Important information
Tip
Useful advice for quick and efficient functionality.
Note
Routines or advice for efficient use of the device.
Future Functions, Innovations
The in this document designates the functions that are undergrey–marked text
preparation or development at present.
®
82N TELEKOMUNIKACE a.s., www.2n.cz
2. Description and Installation
This section describes the proper product installation and2N VoiceBlue Next
®
connection.
Here is what you can find in this section:
2.1 Before You Start
2.2 Factory Settings
2.3 Brief Installation Guide
2.4 IP Voice Transmission
2.5 VoiceBlue Next Connection to VoIP
®
92N TELEKOMUNIKACE a.s., www.2n.cz
2.1 Before You Start
Caution
Make sure that you are equipped with all system components
necessary for putting in operation (SIM2N VoiceBlue Next
®
card, VoIP phone and/or duly configured SIP line of your SIP
Proxy, an available 100BaseT socket and a PC for initial
settings).
Product Completeness Check
Before installing this product, check whether the delivery2N VoiceBlue Next
®
complies with the following packing list. Be careful because there may be differences in
the packing list depending on whether you have ordered a two–channel or
four–channel version of the product (different part numbers).2N VoiceBlue Next
®
Package 2ch VBN 4ch VBN
2N VoiceBlue Next
®
1 1
Power supply adapter 1 1
Short antenna 1 None
Long antenna 1 1
Ethernet cable 1 1
CD User Manual and SW 1 1
Wall–mounting set 1 None
SIM card cover including screws 1 None
Rubber feet None 4
Connector Lay–Out (2–Channel Version)
The following connectors are mounted on the bottom:2N VoiceBlue Next
®
Power supply connector – DC jack 2.1mm
10/100BaseT Ethernet connector
RESET button – press for a short time to restart the GSM gateway and for a long time
to restart the GSM gateway and download the factory settings.
®
102N TELEKOMUNIKACE a.s., www.2n.cz
Connector Lay–Out (4–Channel Version)
The following connectors are mounted on the bottom:2N VoiceBlue Next
®
10/100BaseT Ethernet connector with PoE support
RESET button – press for a short time to restart the GSM gateway and for a long
time to restart the GSM gateway and download the factory settings.
Antenna connector for all GSM/UMTS channels
SIM holder
Find a power supply connector (DC Jack 2.1mm) and type plates at the rear.
Status LED Indicators
The states are indicated by LEDs on the front and system2N VoiceBlue Next
®
connector sides. For the LED types see the table below.
®
112N TELEKOMUNIKACE a.s., www.2n.cz
SIM Card Placement (2–Channel Version)
Lift off the SIM card holder on the backside, insert the SIM card2N VoiceBlue Next
®
and replace the holder, securing the latch.
®
122N TELEKOMUNIKACE a.s., www.2n.cz
SIM Card Placement (4–Channel Version)
Insert a SIM card into one of the four SIM holders on the front 2N VoiceBlue Next
®
making sure that the chip contacts are at the front bottom. The SIM holders are
equipped with the push&pull technology for facilitation.
Caution
Remember to call forwarding, call barring, preferentialset
network(s), SMS centre and similar provider and SIM card
services in your mobile phone before inserting the SIM card
in .2N VoiceBlue Next
®
If two SIM cards are used, both of them must have an
, or must be selected.identical PIN PIN request disable
Disconnect 2N VoiceBlue Next®from the power supply
before inserting the SIM cards!
Licences
2N VoiceBlue Next® may contain time–limited software licences (SIP signalling,
Mobility Extension, e.g.) that render services for limited hours only. Every gateway
restart adds one hour to the internal licence counter. To check the current licence
status, use the web interface of the gateway (refer to ), or the AT interface ofSubs. 3.4
the Telnet protocol (refer to ).S. 4
Caution
A GSM gateway with an expired licence cannot process any
incoming and/or outgoing calls! To avoid this, ask your dealer
for licence prolongation or an unlimited licence!
®
132N TELEKOMUNIKACE a.s., www.2n.cz
GSM/UMTS Network Restriction
Some types may be restricted to certain GSM/UMTS networks2N VoiceBlue Next
®
only. If so, the red indicator at the given GSM/UMTS module is on and the 'netw–err'
cause is detected. Contact your dealer please for more information.
Tip
Contact your dealer please for more information.
Potential GSM/UMTS Troubles
All 2N GSM gateways work reliably under a long–time full load. The following problems
may be caused by GSM/UMTS networks:
GSM/UMTS module(s) cannot log in, log in slowly, or log out occasionally. This
problem may be caused by any of the following situations:
The GSM/UMTS signal is low. The minimum signal level should be
approximately . If lower, change the antenna position or type!–80dBm
The GSM/UMTS cell (BTS) to which the GSM/UMTS modules are trying to
log in is overloaded. Change the antenna position or reduce the count of
the logged–in GSM/UMTS modules.
One of the GSM/UMTS modules is permanently logged–out or fails to make
outgoing calls:
The problem indicates a GSM/UMTS network overload on the installation
site. To eliminate the problem, set the parameter to Relax delay 2
(refer to the subsection). If the GSMseconds GSM Basic Parameters
module fails to log in or rejects to make outgoing GSM calls even after the
gateway restart, consult your GSM provider for your SIM card/GSM module
availability.
The manufacturer shall not be held liable for any SIM card or provider service
unavailability in the case of a breach of the provider's SIM terms and conditions for the
SIM card use.
®
142N TELEKOMUNIKACE a.s., www.2n.cz
2.2 Factory Settings
The table below includes the factory settings for the key configuration parameters of
the GSM gateway:
Parameter Value
IP address 192.168.1.2
IP mask 255.255.255.0
IP gateway 192.168.1.1
Username Admin
Password 2n
Caution
Remember to the username and password thechange during
first gateway configuration to avoid unauthorised access!
®
152N TELEKOMUNIKACE a.s., www.2n.cz
2.3 Brief Installation Guide
SIM Card Inserting/Removing
For the correct handling of SIM cards refer to the SIM Card Placement subsection.
Caution
Make sure that the GSM gateway is off before inserting and
removing SIM cards to avoid the GSM/UMTS module damage.
Installation Conditions
The following installation conditions have to be met for proper installation:
2N VoiceBlue Next® is to be installed on a site with enough free space.
2N VoiceBlue Next® can be mounted on a vertical surface (2–channel version),
or on a horizontal surface or into a system rack (4–channel version). It is
possible to operate in another working position too, e.g.2N VoiceBlue Next
®
on a desk, for a short time for servicing and testing purposes, for example.
Any excess of the allowed working temperature may not affect the 2N
®
function immediately but may result in faster ageing and lowerVoiceBlue Next
reliability. For the allowed working temperature and humidity ranges refer to S. 5
2N VoiceBlue Next® is not designed for high–vibration environments such as
means of transport, machine rooms, and similar.
2N VoiceBlue Next® is not designed for dusty environments or places exposed
to high humidity and temperature changes.
2N VoiceBlue Next® may not be exposed to aggressive gases, acid and solvent
vapours, and so on.
2N VoiceBlue Next® is intended for indoor use. It may not be exposed to rain,
flowing water, condensing moisture, fog, and so on.
2N VoiceBlue Next® may never be exposed to direct sunshine or placed close
to heat sources (radiators).
A sufficient clearance must be kept over and under for 2N VoiceBlue Next
®
cabling and air flow to carry off the heat.
A sufficient GSM/UMTS signal intensity has to be provided for 2N VoiceBlue
®
.Next
An adequate capacity of the GSM/UMTS network has to be ensured (no BTS
overload). Remember that multiple GSM gateways used in one location may
overload the base transceiver station (BTS) you are currently logged in to. This
may lead to a permanent or occasional rejection of GSM/UMTS calls!
No strong electromagnetic radiation is allowed on the 2N VoiceBlue Next
®
installation site.
No strong electromagnetic reflections are allowed on the 2N VoiceBlue Next
®
antenna installation site.
An inappropriate location of or its antenna close to2N VoiceBlue Next
®
television, broadcasting and/or other rf–sensitive sets may impair the function of
these sets.
Being a source of radio frequency emissions, the antenna2N VoiceBlue Next
®
®
162N TELEKOMUNIKACE a.s., www.2n.cz
1.
2.
should not occur in the close vicinity of the human body. The health hazard is
higher than with mobile phones as, generally, gateways shared by multiple users
show a very high traffic.
Make sure that the VoIP connection has been configured properly according to
the SIP and other VoIP recommendations.
It is recommended that the power supply adapter should be connected to a
network with a UPS back–up and due overvoltage protection.
Wall Mounting (2–Channel Version)
Follow the instructions below to wall mount :2N VoiceBlue Next
®
Drill two screws into the wall in a relative distance matching the wall mounting
holes in the rear. 2N VoiceBlue Next
®
The maximum screw head – wall
distance is 5mm.
Hang the unit onto the pre–drilled screws.2N VoiceBlue Next
®
Caution
Do not open the GSM gateway during wall mounting to avoid
product damage and subsequent warranty invalidation!
The screw head – wall distance must allow for simple handling
such as removing from the wall.
®
172N TELEKOMUNIKACE a.s., www.2n.cz
1.
2.
3.
1.
Horizontal Mounting (4–Chanel Version)
2N VoiceBlue Next® is ready for mounting on a horizontal support. You can stick
rubber feet (included in the delivery) on the device if necessary. Follow the instructions
below:
Put the GSM gateway carefully on a stable horizontal support with its bottom side
up.
Stick the rubber feet into the corners as shown below.
Place the device on a stable horizontal support.
caution
Refer to the Proper Location subsection for correct placing!
System Rack Mounting (4–Channel Version)
2N VoiceBlue Next® can be mounted into a system rack. Purchase the rack
accessories separately under Part No. . The accessory pack includes the5051099E
following components:
Components Pieces
Short wing 2
Long wing 1
Rear connecting plate 1
Upper connecting plate 1
Mounting screws 12
Rack screws 4
Single Mounting
Follow the instructions below to mount a single unit into a system rack:
Fit the rack wings to the right and left sides using four screws for each wing
(included in the package). The positions of the long and short wings are optional
®
182N TELEKOMUNIKACE a.s., www.2n.cz
1.
2.
1.
2.
and depend on the installation site conditions.
Having screwed the wings, place the GSM gateway into a free 1U place of the
system rack fitting it with four rack screws (included in the package).
Pair Mounting
Follow the instructions below to rack mount two GSM gateways into one 1U place:
Put the GSM gateways next to each other making their sides touch each other.
Fit the short wings (included in the package) onto the free gateway ends with the
screws enclosed.
Insert the connecting plates (BE CAREFUL! The rear and upper connecting plates
have different drilled holes – the upper plate holes are larger and without
threading) in the upper and rear holes of one GSM gateway first. Then connect
the other unit.
®
192N TELEKOMUNIKACE a.s., www.2n.cz
2.
3. Place the GSM gateway pair into a free 1U place in the system rack and fit it with
four rack screws (included in the package).
®
202N TELEKOMUNIKACE a.s., www.2n.cz
Caution
The rear and upper connecting plates have different holes – the
upper plate holes are larger and without threading.
Make sure that the plate does not get into the device to avoid
electric short–circuit inside the GSM gateway.
Leave 2 cm free space at least over and under the GSM gateway
for better ventilation (airflow)!
Power Supply Connection
Use only the power supply adapter included, or, with the power over Ethernet, a
certified PoE adapter to feed the gateway. Make sure that the electric distribution
network voltage is in compliance with the data on the supply adapter plate before
plugging the adapter. First plug the supply adapter into the mains socket and only then
connect the adapter connector to the gateway. Refer to the status indicators.
Warning
Connecting a defective or inappropriate power supply adapter
may lead to a temporary or permanent 2N VoiceBlue Next
®
error!
Never connect using the PoE and a local2N VoiceBlue Next
®
adapter at the same time to avoid permanent 2N VoiceBlue
®
malfunction!Next
Check whether the antenna is connected before plugging the
adapter. Feeding the device without antenna connection
may result in the GSM module transmitter damage.
Antenna Connection
2N VoiceBlue Next® is equipped with a SMA female antenna connector for all the
GSM/UMTS modules. The external antenna should always be installed vertically on a
site with a good wireless signal.
Warning
Tighten the antenna – connector gently with your hand
!never use a wrench
Being a source of radio frequency emissions, the 2N
®
antenna should not occur in the close vicinity VoiceBlue Next
of the human body. The is higher than withhealth hazard
mobile phones as, generally, gateways shared by multiple users
show a very high traffic.
®
212N TELEKOMUNIKACE a.s., www.2n.cz
Note
The antenna has a sufficient gain for a trouble–free operation
under normal conditions. If the signal is poor or you want to
place your antenna separately from , you2N VoiceBlue Next
®
can use an antenna with an SMA–connector terminated cable.
The antenna should be mounted vertically.
Refer to the section for the antenna andTechnical Parameters
cable parameters.
Ethernet Cable Connection
To connect into an Ethernet network use a standard straight2N VoiceBlue Next
®
cable terminated with RJ–45 connectors (included in the package). The GSM gateway
supports the 10BaseT and 100BaseT standards, the Ethernet connection status is
indicated by the status LED indicators located on the RJ–45 connector (refer to Subs.
for details).2.1
For the Ethernet interface factory settings for refer to .2N VoiceBlue Next
®
Subs. 2.2
Caution
Resetting factory values results in a change of the 2N
®
Ethernet interface configuration! VoiceBlue Next
Using a defective Ethernet cable may lead to a high packet loss
rate in the Ethernet network and subsequent instability and poor
quality of all GSM/UMTS calls!
RJ–45 connector for LAN connection
Antenna Splitter
The antenna splitter is a passive component that combines multiple GSM/UMTS
channels into one antenna. In , it combines two/four antennae2N VoiceBlue Next
®
into one. The antenna splitter is placed in the installation box. It is a passive element –
it has a characteristic signal attenuation value that the antenna connected must
compensate. No antenna splitter is used for one–channel gatewa2N VoiceBlue Next
®
ys.
®
222N TELEKOMUNIKACE a.s., www.2n.cz
Licence Restrictions
2N VoiceBlue Next® may contain time limited software licences. See p. for more
information.
Firmware Upgrade
Please upgrade the firmware before installing the system. Check2N VoiceBlue Next
®
the web sites for the latest firmware for this gateway type.www.2N.cz
Warning
Use the for this gateway type only! Anyfirmware certified
other firmware type may damage 2N VoiceBlue Next
®
!irreversibly
Follow the instructions below to download firmware easily using the gateway web
interface:
Connect your PC and the gateway into the Ethernet network.
Open the web browser (MS Internet Explorer 9 and higher or Mozzila Firefox 4
and higher are recommended).
Enter the to register at the web interface.http://IP_address
Click on , then on and select the new firmware file.Upgrade Browse
Click on the icon in the lower part of the web page.Download firmware
2N VoiceBlue Next® will upgrade the firmware automatically.
®
232N TELEKOMUNIKACE a.s., www.2n.cz
2.4 IP Voice Transmission
Speech Encoding Methods
Voice transmission is strictly separated from signalling in VoIP networks. Modern VoIP
networks mostly use the RTP (Realtime Transport Protocol) for voice transmission. The
purpose of the RTP is only to transmit data (voice) from a source to a destination at
real time. Codecs are used to save the channel data capacity. Codecs process the voice
signal using variable algorithms to minimise the volume of user data. The degree of
compression used by the codec affects the quality of voice transmission. Thus, the
better voice transmission is required, the wider data range (the higher transmission
rate) is needed. The MOS (Mean Opinion Score) scale is used for rating voice
transmission quality, where 1 means the worst and 5 the best quality. For a survey of
the codecs supported by refer to the table below.2N VoiceBlue Next
®
Codecs supported
Standard Algorithm Transmission rate [kbps] MOS
G.711a PCM 64 4.1
G.711u PCM 64 4.1
G.729
*
CS–ACELP 8 3.92
[*]
G.729 is an optional part of the system.
For , quadruple the above mentioned rates (two fully duplex 2N VoiceBlue Next
®
calls) and add the TCP and IP header transmission rate to the result to get the
resultant transmission rate.
It is important to keep both a stable appropriate transmission rate during connection
and a small and identical transmission time per data packet in order to maintain a
high–quality voice transmission.
G.711 – this codec is used in digital telephone networks. The PCM (Pulse Code
Modulation) is used for voice signal encoding. The sampled signal is encoded in
12 bits and then compressed using a non–linear scheme into the resultant 8 bits.
Europe uses the A–law compression system while North America and Japan obey
the µ–law. The resultant data flow is 64 kbps.
G.729 – this codec uses the CS–ACELP (Conjugate–Structure
Algebraic–Code–Excited Linear–Prediction) algorithm with the resultant
transmission rate of 8 kbps. The speech signal is split into blocks of 10 ms each.
The parameters of these blocks are then inserted in frames of the size of 10
bytes. 2–byte frames are generated for noise transmission.
During call set–up, a codec is selected automatically for voice transmission. 2N
®
supports the codecs included in the table above. The type of codec toVoiceBlue Next
be used depends on your VoIP network (individual devices) and your 2N VoiceBlue
®
configuration. is designed primarily for VoIP corporateNext 2N VoiceBlue Next
®
networks and tries to meet the opponent's codec requirements. If a codec is requested
that is incompatible with , the call will be rejected.2N VoiceBlue Next
®
The SIP and ITU–T H.323 recommended protocols are mostly used for connection
establishing, maintaining and cancelling. uses the (Session2N VoiceBlue Next
®
SIP
®
242N TELEKOMUNIKACE a.s., www.2n.cz
Initiation Protocol) signalling.
Tip
In the case of separated direct connection of your SIP Proxy
and , use the G.711 codec to achieve a 2N VoiceBlue Next
®
high voice quality.
SIP Components
The following components are involved in the SIP message exchange:
UAC (User Agent Client) – the terminal device client, which initiates SIP
signalling.
UAS (User Agent Server) – the terminal device server, which responds to SIP
signalling from the UAC.
UA (User Agent) – a SIP network terminal (SIP phones, gateways to other
networks, etc.), which contains the UAC and UAS.
Proxy server – receives connection requests from the UA and transfers them to
the next Proxy server if the given station is not under it administration.
Redirect server – receives connection requests, but, instead of sending them to
the called line, sends them back to the requesting device asking for where to
route the request.
Location server – receives registration requests from the UA and updates the
terminal database accordingly.
All the server components (Proxy, Redirect, Location) are mostly on one physical
device called Proxy server, which is responsible for keeping a client database and
connection establishing, maintaining and terminating, as well as call routing.
The VoIP–GSM gateway acts as a UA in any case (has the same 2N VoiceBlue Next
®
functions as a VoIP phone), i.e. receives call set–up requirements and, on the basis of
its inner LCR table, routes calls to GSM networks.
None of the SIP–defined server components are integrated in the 2N VoiceBlue
®
gateway.Next
SIP Signalling Messages
Below is a list of messages sent via the SIP:
INVITE – connection set–up request;
ACK – INVITE confirmation by the final message addressee;
BYE – connection termination;
CANCEL – failed connection cancellation;
REGISTER – UA registration with the SIP Proxy;
OPTIONS – server capability query.
The answers to the SIP messages are numerically coded as the case is with the http
protocol. Below are the most important ones:
1XX – information messages (100 – trying, 180 – ringing, 183 – progress);
2XX – successful request completion (200 – OK);
3XX – request forwarding needed (302 – temporarily moved, 305 – use Proxy);
4XX – error (403 – forbidden, 486 – busy here);
5XX – server error (500 – Server Internal Error, 501 – not implemented);
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252N TELEKOMUNIKACE a.s., www.2n.cz
6XX – global failure (606 – not acceptable).
®
262N TELEKOMUNIKACE a.s., www.2n.cz
2.5 VoiceBlue Next Connection to VoIP
Since communicates using the SIP only, this subsection outlines2N VoiceBlue Next
®
solutions for its interconnection with networks working with the H.323 signalling
protocols. can be used either in the Point–to–Point or2N VoiceBlue Next
®
Point–to–Multipoint mode with the SIP Proxy server.
SIP / H.323 Interconnection
SIP–based devices cannot communicate with H.323.supporting devices directly, but
through a SIP/H.323 gateway. This gateway transfers signalling messages from/to the
protocols. Using the RTP for multimedia data transmission, the SIP and H.323 protocols
can go on communicating directly when the SIP/H.323 gateway connection is
established. Thus, the SIP/H.323 gateway helps integrate into2N VoiceBlue Next
®
the existing H.323 environment.
Point–to–Point Configuration
2N VoiceBlue Next® can communicate with just one SIP VoIP phone or device (a
VoIP gateway, e.g.) in the PTP (Point–to–Point) mode. The IP address of the opposite
party is always selected as the Proxy server IP address in for2N VoiceBlue Next
®
this mode.
The PTP configuration is often used for testing purposes before2N VoiceBlue Next
®
implementation into the VoIP network. Refer to the figure below for the PTP scheme.
Tip
If you set the incoming SIP Proxy IP address to '0.0.0.0' in the
configuration, the GSM gateway will2N VoiceBlue Next
®
receive calls from any VoIP device.
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272N TELEKOMUNIKACE a.s., www.2n.cz
All calls outbound to GSM are routed to the gateway in the2N VoiceBlue Next
®
Point–to–Point mode that uses .2N VoiceBlue Next
®
Point–to–Multipoint Configuration
Point–to–Multipoint is a classical scheme of a distributed VoIP network with one or
more SIP Proxy servers (VoIP gateway). The SIP Proxy server is a software PBX (or a
standard PBX extended with VoIP services), which is responsible for all VoIP signalling.
Multiple source devices (VoIP phones, e.g.) and multiple target devices ( 2N
®
, e.g.) can be used in this mode. An internal routing algorithm (LeastVoiceBlue Next
Cost Router, LCR) of your SIP Proxy is used for routing outgoing GSM and other calls in
this mode. Calls to GSM networks can be routed via the gateway2N VoiceBlue Next
®
s. All SIP signalling is governed by the SIP Proxy server and the subsequent voice
stream is based on the Point–to–Point RTP.
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282N TELEKOMUNIKACE a.s., www.2n.cz
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