About This Guide
This guide provides information about the features and functions of the Cisco Voice Switch Service Module (VXSM) Release 5.5.
Guide Revision History
This guide provides configuration procedures for Cisco VXSM features.
November 14, 2008
March 9, 2007
August 31, 2006
May 5, 2006
January 24, 2006
September 30, 2005
Description of Changes in Release 5.5
•T.38 Fax Relay Support for SG3 Fax Machines at G3 Speeds
The SG3 Fax Spoofing feature allows Super Group 3 (SG3) fax machines to interoperate over T.38 fax-relay over VoIP switched calls. SG3 fax machines inter operates over T.38 with G3 fax machines by negotiating SG3 speeds up to 14400bps and SG3-SG3 calls interoperate at SG3 speeds up to 33600bps over fax pass-through.
VXSM implements a fax negotiation spoof that forces the SG3 fax machines to send the faxes over T.38 Group 3 (G3) modulations.
The following commands were modified to support this feature:
•CLI and SNMP support for Number of Active and Emergency Calls
With H.248, display counters are used to obtain information about the number of active and emergency voice calls that have been placed during a specified period of time. These counters are displayed at gateway level, virtual gateway (VGW), and at line level interface. In xGCP, only determination of number of active calls is supported. The dspcallcnt command was added to support this feature.
•IP-IP Transcoding for H.248
VXSM functions as a transcoding gateway and provides the interworking functionality for gateways that differ in bearer capabilities to communicate with each other. The capabilities between two gateways may differ depending on the bearer properties such as Codec, packetization period, etc.,or incompatible features such as fax or modem pass through, fax relay, or DTMF relay.
When VXSM acts as a transcoding gateway a back card is not required.
The following commands were added to support this feature:
The following commands were modified:
•G.723 Annex A and G.729 Annex B support for H.248
VXSM supports VAD activation and de-activation in conjunction with the G.729 Codec and G.723 Codec, using the "annexb" and "annexa" values in fmtp attribute respectively. For the G.723 Annex A and G.729 Annex B support for H.248 feature, the following commands were added:
•OOS and IS of VXSM Trunks at all Interface Levels
This feature allows VXSM to configure the administrative status of the path to down, even if the TDM configuration exists for a particular path or line.
•Service Independent Intercept
VXSM supports Lawful Intercept (LI), based on Cisco Service Independent Intercept (SII) Architecture. SII is Cisco implementation of LI based on Simple Network Management Protocol Version 3 (SNMPv3) provisioning architecture.
•DD and DG Package Support for IP Terminations
VXSM supports DTMF Detection (DD) and DTMF Generator (DG) package that are used by the gateways to detect the digits on both TDM and IP terminations.
The cnftermtype command is modified to support detection and generation of dual tone multifrequency (DTMF) feature. The following commands are added to support this feature:
•New Codec Support for H.248, MGCP, and TGCP Signaling
VXSM supports the following new Codecs for H.248, MGCP, and TGCP signaling:
–Adaptive Multi-Rate (AMR) Codec
–GSM Enhanced Full Rate (GSM-EFR)
–Internet Low Bitrate Codec (iLBC)
The following features were added to support this feature:
–cnfcodecspecific - amrnb
–dspcodecspecific - amrnb
–cnfcodecspecific - ilbc
–dspcodecspecific - ilbc
The following commands were modified:
•Bearer Tracing for IP-IP calls
VXSM Release 5.5.00 adds support for IP-IP bearer tracing. Bearer tracing for TDM-IP calls is already supported. For the bearer tracing for IP-IP calls feature, the addbearertraceendpt command was modified.
•Non-CALEA to CALEA VXSM Image Upgrade Support
In this release, VXSM supports graceful upgrade from Non-CALEA image to CALEA image. Upgrade is supported for all three call control protocols: H.248, MGCP, and TGCP.
•NTE and NSE Payload Negotiation Support for H.248
VXSM supports Named Telephone Events (NTE) and Named Signaling Events (NSE) payload negotiation for H.248. This includes only the payload negotiation; events will not be negotiated in both the cases (NTE and NSE).
The Cisco VXSM Configuration Guide describes the use and configuration of VXSM in switching and nonswitching (trunking) applications.
The Cisco VXSM Configuration Guide is intended for experienced Cisco MGX users who are involved with the installation and configuration of the Cisco-based media gateway applications.
This installation guide has the following chapters:
•Chapter 1—Cisco Voice Switch Service Module Introduction
•Chapter 2—Cisco Voice Switch Service Module Description
•Chapter 3—Configuring VoIP Switching Applications
•Chapter 4—Configuring Switches for AAL2 Trunking Applications
•Chapter 5—Configuring VXSM Features
•Chapter 6—VXSM as an SS7 Signaling Gateway
•Chapter 7—VXSM as a Transcoding Gateway
•Chapter 8—Implementing Lawful Intercept on VXSM
•Chapter 9—Configuring Lawful Intercept Support
•Chapter 10—Loading and Upgrading VXSM Code Images
•Chapter 11—VXSM Troubleshooting
•Appendix A—Media Gateway Clocking
Obtaining Documentation, Obtaining Support, and Security Guidelines
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