Cisco Cisco IOS Software Release 12.2(8)T

ATM Software Segmentation and Reassembly (SAR)

Cisco IOS Release 12.2(8)T

Configuring Subcell Multiplexing for AAL2 Voice

This section describes the configuration tasks necessary to enable AAL2 common part sublayer (CPS)
subcell multiplexing when the Cisco 2600 series router or a Cisco 3660 interoperates with a voice
interface service module (VISM) in an MGX switch.

To configure the Cisco 2600 series router or the Cisco 3660 to perform subcell multiplexing, complete
the following steps beginning in global configuration mode:

Verifying the MGCP CAS PBX and AAL2 PVC Configurations

Use these commands to verify the configuration settings:

Command

Purpose

Step 1

Router(config)# voice service voatm

Enters voice-service configuration mode.

Step 2

Router(config-voice-service)# session protocol aal2

Enters voice-service-session configuration mode
and specifies AAL2 trunking.

Step 3

Router(config-voice-service-session)# subcell-mux

number

Enables subcell multiplexing. The number is time in
milliseconds.

By default, subcell multiplexing is not enabled.

Step 4

Router(config-voice-service-session)# end

Exits configuration mode.

Command

Purpose

Step 1

Router# show dial-peer voice sum

Displays the status of the dial peer. The dial peer
should be active. If it is not, enter the command:

Router(config-dial-peer)# no shut

Step 2

Router# show run

Displays the current configuration settings.