2N VoiceBlue MAX v1.0 User Manual

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2N® VoiceBlue MAX

GSM/UMTS/VoIP Gateway

User Manual

Version

1.0.0

 

Firmware

1.9.2

www.2n.cz

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 MAX 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

14

2.3

Brief Installation Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

15

2.4

IP Voice Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

22

2.5

2N® VoiceBlue MAX Connection to VoIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

25

2.6

Available 2N® VoiceBlue MAX Connections . . . . . . . . . . . . . . . . . . . . . . . . . . .

27

3. VoiceBlue MAX Configuration . . . . . . . . . . . . . . . . . . . . . . . .

28

3.1

Factory Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

29

3.2

Basic Configuration – Step by Step . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

30

3.3

Call Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

32

3.4

Web Configuration Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

36

4. Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

58

4.1

Terminal-Based Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

59

4.2

AT Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

60

4.3 LOGs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

68

4.4 CDR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

70

4.5

Available Status Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

71

4.6

Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

75

4.7

Tracing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

78

4.8

External SMS Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

79

5. Technical Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

6. Supplementary Information . . . . . . . . . . . . . . . . . . . . . . . . . . 83

6.1

Regulations and Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

84

6.2

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

85

6.3

List of Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

86

6.4

General Instructions and Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

87

1. Product Overview

In this section, we introduce the 2N® VoiceBlue MAX product, outline its application 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

2N® TELEKOMUNIKACE a.s., www.2n.cz

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1.1 Product Description

2N® VoiceBlue MAX is a device that helps directly interconnect a SIP–supporting VoIP network with GSM networks and can be used for direct connection with a SIP telephone set. 2N® VoiceBlue MAX contains 4x FXS ports for analogue telecommunication equipment. The voice mode, i.e. outgoing and incoming calls, is the basic function of the gateway. 2N® VoiceBlue MAX is equipped with all voice mode functions and provides the highest user comfort. In addition to voice transmission, 2N ® VoiceBlue MAX enables you to send and receive text messages (SMS). 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. 2N® VoiceBlue MAX can be combined with the 2N® Mobility Extension service (remote GSM extension) for up to 8 users.

2N® VoiceBlue MAX Basic Features

Compact size

Four GSM/UMTS channels

System rack installation option

Intelligent incoming/outgoing call routing

SMS sending/receiving (web, AT interfaces)

User–friendly web interface

Power over Ethernet (PoE)

A single antenna for 4 GSM modules

Fouri FXS ports

Automatic call records and detailed statistics

2N® Mobility Extension support

Possibility of SMS sending+receiving via web interface

Tone detection

2N® TELEKOMUNIKACE a.s., www.2n.cz

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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.

2N® TELEKOMUNIKACE a.s., www.2n.cz

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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 2N® VoiceBlue MAX firm ware version and the User Manual refer to the 2N web sites.

2N® TELEKOMUNIKACE a.s., www.2n.cz

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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

Important information for system functionality.

Tip

Useful advice for quick and efficient functionality.

Note

Routines or advice for efficient use of the device.

Future Functions, Innovations

The grey–marked text in this document designates the functions that are under preparation or development at present.

2N® TELEKOMUNIKACE a.s., www.2n.cz

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2. Description and Installation

This section describes the proper 2N® VoiceBlue MAX product installation and 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 2N® VoiceBlue MAX Connection to VoIP 2.6 Available 2N® VoiceBlue MAX Connections

2N® TELEKOMUNIKACE a.s., www.2n.cz

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2.1 Before You Start

Caution

Make sure that you are equipped with all system components necessary for putting 2N® VoiceBlue MAX in operation (SIM card, VoIP phone and/or duly configured SIP line of your SIP Proxy, an available 100BaseT socket and a PC for initial settings, analogue telephone).

Product Completeness Check

Before installing this product, check whether the 2N® VoiceBlue MAX delivery complies with the following packing list.

Package

pcs

2N® VoiceBlue MAX

1

Power supply adapter

1

Long antenna

1

Ethernet cable

1

CD User Manual and SW

1

Rubber feet

4

Connector Lay–Out

The following connectors are mounted on the 2N® VoiceBlue MAX bottom:

10/100BaseT Ethernet connector with PoE support

4xFXS connector RJ-45

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.

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2N VoiceBlue MAX v1.0 User Manual

Status LED Indicators

The 2N® VoiceBlue MAX states are indicated by LEDs on the front and system connector sides. For the LED types see the table below.

SIM Card Placement

Insert a SIM card into one of the four SIM holders on the 2N® VoiceBlue MAX front making sure that the chip contacts are at the front bottom. The SIM holders are equipped with the push&pull technology for facilitation.

2N® TELEKOMUNIKACE a.s., www.2n.cz

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Caution

Remember to set call forwarding, call barring, preferential network(s), SMS centre and similar provider and SIM card services in your mobile phone before inserting the SIM card in 2N® VoiceBlue MAX.

If two SIM cards are used, both of them must have an identical PIN, or PIN request disable must be selected.

Disconnect 2N® VoiceBlue MAX from the power supply before inserting the SIM cards!

Licences

2N® VoiceBlue MAX 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 Subs. 3.4), or the AT interface of the Telnet protocol (refer to Section 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!

GSM/UMTS Network Restriction

Some 2N® VoiceBlue MAX types may be restricted to certain GSM/UMTS networks 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.

2N® TELEKOMUNIKACE a.s., www.2n.cz

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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 –80dBm. If lower, change the antenna position or type!

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 Relax delay parameter to 2 seconds (refer to the GSM Basic Parameters subsection). If the GSM 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.

2N® TELEKOMUNIKACE a.s., www.2n.cz

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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 change the username and password during the first gateway configuration to avoid unauthorised access!

2N® TELEKOMUNIKACE a.s., www.2n.cz

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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 MAX is to be installed on a site with enough free space.

2N® VoiceBlue MAX can be mounted on a horizontal surface or into a system rack. It is possible to operate 2N® VoiceBlue MAX in another working position too, for a short time for servicing and testing purposes, for example.

Any excess of the allowed working temperature may not affect the 2N® VoiceBlue MAX function immediately but may result in faster ageing and lower reliability. For the allowed working temperature and humidity ranges refer to Section 5

2N® VoiceBlue MAX is not designed for high–vibration environments such as means of transport, machine rooms, and similar.

2N® VoiceBlue MAX is not designed for dusty environments or places exposed to high humidity and temperature changes.

2N® VoiceBlue MAX may not be exposed to aggressive gases, acid and solvent vapours, and so on.

2N® VoiceBlue MAX is intended for indoor use. It may not be exposed to rain, flowing water, condensing moisture, fog, and so on.

2N® VoiceBlue MAX may never be exposed to direct sunshine or placed close to heat sources (radiators).

A sufficient clearance must be kept over and under 2N® VoiceBlue MAX for cabling and air flow to carry off the heat.

A sufficient GSM/UMTS signal intensity has to be provided for 2N® VoiceBlue MAX.

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 MAX installation site.

No strong electromagnetic reflections are allowed on the 2N® VoiceBlue MAX antenna installation site.

An inappropriate location of 2N® VoiceBlue MAX or its antenna close to television, broadcasting and/or other rf–sensitive sets may impair the function of these sets.

Being a source of radio frequency emissions, the 2N® VoiceBlue MAX antenna

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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.

Horizontal Mounting

2N® VoiceBlue MAX 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:

1.Put the GSM gateway carefully on a stable horizontal support with its bottom side up.

2.Stick the rubber feet into the corners as shown below.

3.Place the device on a stable horizontal support.

caution

Refer to the Proper Location subsection for correct placing!

System Rack Mounting

2N® VoiceBlue MAX can be mounted into a system rack. Purchase the rack accessories separately under Part No. 5051099E. The accessory pack includes the following components:

2N® TELEKOMUNIKACE a.s., www.2n.cz

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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:

1.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 and depend on the installation site conditions.

2.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:

1.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.

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2.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.

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).

2N® TELEKOMUNIKACE a.s., www.2n.cz

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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 MAX error!

Never connect 2N® VoiceBlue MAX using the PoE and a local adapter at the same time to avoid permanent 2N® VoiceBlue MAX malfunction!

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 MAX 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.

2N® TELEKOMUNIKACE a.s., www.2n.cz

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Warning

Tighten the antenna connector gently with your hand never use a wrench!

Being a source of radio frequency emissions, the 2N® VoiceBlue MAX antenna 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.

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 2N® VoiceBlue MAX, you can use an antenna with an SMA–connector terminated cable. The antenna should be mounted vertically.

Refer to the Technical Parameters section for the antenna and cable parameters.

Ethernet Cable Connection

To connect 2N® VoiceBlue MAX into an Ethernet network use a standard straight 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. 2.1 for details).

For the Ethernet interface factory settings for 2N® VoiceBlue MAX refer to Subs. 2.2.

Caution

Resetting factory values results in a change of the 2N® VoiceBlue MAX Ethernet interface configuration!

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

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Antenna Splitter

The antenna splitter is a passive component that combines multiple GSM/UMTS channels into one antenna. In 2N® VoiceBlue MAX, it combines two/four antennae 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 2N® VoiceBlue MAX gatewa ys.

Licence Restrictions

2N® VoiceBlue MAX may contain time limited software licences. See Subs. 2.1 for more information.

Firmware Upgrade

Please upgrade the 2N® VoiceBlue MAX firmware before installing the system. Check the www.2N.cz web sites for the latest firmware for this gateway type.

Warning

Use the firmware certified for this gateway type only! Any other firmware type may damage 2N® VoiceBlue MAX 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 http://IP_address to register at the web interface.

Click on Upgrade, then on Browse and select the new firmware file.

Click on the Download firmware icon in the lower part of the web page. 2N® VoiceBlue MAX will upgrade the firmware automatically.

2N® TELEKOMUNIKACE a.s., www.2n.cz

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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 2N® VoiceBlue MAX refer to the table below.

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

For 2N® VoiceBlue MAX, quadruple the above mentioned rates (two fully duplex 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® VoiceBlue MAX supports the codecs included in the table above. The type of codec to be used depends on your VoIP network (individual devices) and your 2N® VoiceBlue MAX configuration. 2N® VoiceBlue MAX is designed primarily for VoIP corporate networks and tries to meet the opponent's codec requirements. If a codec is requested that is incompatible with 2N® VoiceBlue MAX, the call will be rejected.

The SIP and ITU–T H.323 recommended protocols are mostly used for connection establishing, maintaining and cancelling. 2N® VoiceBlue MAX uses the SIP (Session Initiation Protocol) signalling.

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Tip

In the case of separated direct connection of your SIP Proxy and 2N® VoiceBlue MAX, use the G.711 codec to achieve a 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 2N® VoiceBlue MAX VoIP–GSM gateway acts as a UA in any case (has the same 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 MAX gateway.

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); 6XX – global failure (606 – not acceptable).

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2.5 2N® VoiceBlue MAX Connection to VoIP

Since 2N® VoiceBlue MAX communicates using the SIP only, this subsection outlines solutions for its interconnection with networks working with the H.323 signalling protocols. 2N® VoiceBlue MAX can be used either in the Point–to–Point or 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 2N® VoiceBlue MAX into the existing H.323 environment.

Point–to–Point Configuration

2N® VoiceBlue MAX 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 2N® VoiceBlue MAX for this mode.

The 2N® VoiceBlue MAX PTP configuration is often used for testing purposes before 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 2N® VoiceBlue MAX configuration, the GSM gateway will receive calls from any VoIP device.

2N® TELEKOMUNIKACE a.s., www.2n.cz

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All calls outbound to GSM are routed to the 2N® VoiceBlue MAX gateway in the Point–to–Point mode that uses 2N® VoiceBlue MAX.

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® VoiceBlue MAX, e.g.) can be used in this mode. An internal routing algorithm (Least 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 2N® VoiceBlue MAX gateway s. All SIP signalling is governed by the SIP Proxy server and the subsequent voice stream is based on the Point–to–Point RTP.

2N® TELEKOMUNIKACE a.s., www.2n.cz

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2.6 Available 2N® VoiceBlue MAX

Connections

The figure below shows the gateway as DialThru router. PBX/Analogue phone is connected with the gateway by up to four analogue FXS ports, or by using Ethernet interf ace (SIP protocol). Incoming calls from PSTN are directly routed to selected port. Outgoin g calls are using routing accordint to LCR table.

2N® TELEKOMUNIKACE a.s., www.2n.cz

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