Video Gateway overview

The Video Gateway is a CCXML-based call server that provides call control and transaction capabilities for calls made between the PSTN and IP networks. The Video Gateway provides the following functionality:

The Video Gateway is installed as a daemon on Linux machines and is composed of the following components:

These components are based on specific hardware support, including media boards and signaling boards.

Signaling protocols and models

The Video Gateway can implement the following signaling protocols:

The Video Gateway uses SIP/RTP signaling to interface with the IP network. For more information, see ISDN models and ISUP models.

Media capabilities

The Video Gateway supports the following codecs:

Codec type

Codec

Description

Audio

AMR

IETF RFC 3267; 3GPP TS 26.090, 26.101, and 26.073, version 5.3.0, 2004.

G.711 A-law and mu-law

 

G.723.1

 

G.726

 

G.729A

 

Comfort noise

IETF RFC 3389

Video

H.263

Standard: IETF RFC 2190, ITU-T Recommendation H.263, and 3GPP specifications TS.26.111, TS.26.911, TS.26.140.

Encoding format (Profile/Level): Baseline level 10, 20, 30.

Picture format: QCIF Quarter Common Interchange Format (176 x 144) and CIF Common Interchange Format (352 x 288).

Frame rate: 6 to 30 fps. Integer value only. 3G side is up to 15 fps. IP side is determined via SDP negotiation.

Encoding bit rate: Up to 384 kbps. 3G side is 42 kbps. IP side is determined via SDP negotiation.

H.263+

Standard: IETF RFC 2429, ITU-T Recommendation H.263, and 3GPP specifications TS.26.111, TS.26.911, TS.26.140.

Picture format, frame rate, and encoding bit rate are the same as for H.263.

H.264

Standard: IETF draft-ietf-avt-rtp-rfc3984bis-06.txt, ITU-T Recommendation H.264, and 3GPP specifications TS.26.111, TS.26.911, TS.26.140.

Encoding format (Profile/Level): Baseline profile, level 1.0, 1b, 1.1 and 1.2. Packetization mode single-NAL and non-interleave.

Picture format, frame rate, and encoding bit rate are the same as for H.263, except that CIF at 30 fps is not supported.

MPEG-4

Standard: IETF RFC 3016, ISO/IEC 14496-2:2004 and 3GPP specifications TS.26.111, TS.26.911, TS.26.140.

Encoding format (Profile/Level): Simple profile level 0, 1, 2, and 3.

Picture format, frame rate, and encoding bit rate are the same as for H.263.

Fax relay

T.38

 

Transparent media  

NbUP

3GPP TS 29.415

Clearmode

IETF RFC 4040

CCXML scripting engine

The CCXML scripting engine enables the Video Gateway to execute applications written in the W3C Working Draft of CCXML dated 29th June 2005 (http://www.w3.org/TR/2005/WD-ccxml-20050629). You can use CCXML to write applications that provide call control for the duration of a phone call, including call setup, monitoring, and tear-down. You can also use CCXML applications to provide call routing and conferencing functionality.

For more information, see Managing CCXML applications, Fine tuning gateway routing, and the Dialogic® Vision™ CCXML Developer's Manual.

SNMP agent and subagents

The Video Gateway provides an SNMP interface that lets you monitor gateway performance, view statistics, monitor a RAID server, and receive alarms. The gateway uses Net-SNMP as a master agent and the DS1, Call Server, and RAID subagents. The master agent supports SNMPv1, SNMPv2c, and SNMPv3.

For more information, see the Dialogic® Vision™ SNMP Reference Manual.

Fast call setup

The Video Gateway supports the following techniques for speeding up 3G-324M call setup time:

Note: You must obtain the appropriate license to use one of these techniques. For information, see the readme file for this release.

The Video Gateway does not support: