Installation guide

Release Notes for Cisco Voice Interworking Service Module Release 3.0(0)

Part Number OL-2523-01 Rev. B0, January 9, 2004

VISM Features

Call Agent-Controlled VoATM AAL1 and AAL2 SVC

The following operating modes are supported with software Release 3.0(0) for VISM/VISM-PR:

• VoAAL1 switched virtual circuit (SVC), supported with the G.711 codec and clear channel.

Note VAD is not supported in combination with AAL1 SVCs.

• VoAAL2 SVC, supported with the G.711, G.726, G.729a, G.729ab, and G723 codecs and ITU

profiles 1, 2, 3, 7, 8, and custom profiles 100, 101, 110, and 200.

Note CAS is not supported in combination with switched virtual circuits.

Use the cnfvismmode command to configure VISM operating modes.

Note This feature requires you to use a PXM1E or PXM45 in your MGX 8000 Series switch chassis.

AAL1 SVC-Based TDM Hairpinning

VoAAL1 switched virtual circuit (SVC) operating mode is supported with the G.711 codec and clear

channel. The AAL1 SVC operating mode supports TDM hairpinning.

Note VAD is not supported in combination with AAL1 SVCs. CAS is not supported in

combination with SVCs

Use the cnfvismmode command to configure VISM operating modes.

Note This feature requires you to use a PXM1E or PXM45 in your MGX 8000 Series switch chassis.

High Complexity Codec Support for VISM-PR—G.723.1

The high complexity codec G.723.1 is introduced with this release. The VISM-PR card supports this

codec in the newly introduced template number 4. Template number 4 supports all the codecs in template

number 3 and the following:

• G.723.1 high rate (6.3 Kbps)—G.723.1-H

• G.723.1 high rate with VAD—G.723.1a-H

• G.723.1 low rate (5.3 Kbps)—G.723.1-L

• G.723.1 low rate with VAD—G.723.1a-L

The G.723.1 codec, used in combination with the VISM-PR card, supports 144 channels. Refer to

Table 2 for a description of VISM-PR DS0 density when the cards are used in combination with

supported codecs.