Cisco Cisco IOS Software Release 12.4(2)XB6

 lists the release history for this feature.

Not all commands may be available in your Cisco IOS software release. For release information about a 
specific command, see the command reference documentation.

Use Cisco Feature Navigator to find information about platform support and software image support. 
Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images 
support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to 

. An account on Cisco.com is not required.

 lists only the Cisco IOS software release that introduced support for a given feature in a given 

Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS 
software release train also support that feature.

DSP Voice-Quality Statistics in DLCX 
Messages

12.3(3)

12.4(4)T

This feature provides a way to trace a Media Gateway 
Control Protocol (MGCP) call between a Cisco PGW 2200 
and the Cisco IOS gateway by including the MGCP call ID 
and the DS0 and digital signal processor (DSP) channel ID 
in call-active and call-history records.

Voice Quality Enhancements

12.4(11)XW

The Voice Quality Enhancements feature exposes a rich set 
of voice quality metrics through the syslog and CLI 
interfaces.