USE CME 8.6 codec has low bandwidth requirements for calls to/from specific extensions

[Halsser]

I have cisco CME 8.6 on 2921 router and with current configuration I have the following class codec which case my all phone calls use g711alaw

voice class codec 1

codec preference 1 g711ulaw

codec preference 2 g711alaw

codec preference 3 g729r8

codec preference 4 g729br8

 now I have 7942 phone contented to my cme system via VPN from remote site with very limited bandwidth I need force the calls only to/from this remote site phone use another codec that has low bandwidth requirements,can you help me how can I do this job?

[Manish Gogna · Accepted solution]

Hi,

You can configure "codec g729r8" under the ephone config of 7942. As per the following link

http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/admin/configuration/guide/cmeadm/cmebasic.html#54107

"Cisco Unified Communications Manager Express System Administrator Guide - Configuring Phones to Make Basic Calls [Cisco Unified Communications Manager Express] - Cisco

G.729r8 Codec on Remote Phones

You can select the G.729r8 codec on a remote IP phone to help save network bandwidth. The default codec is G.711 mu-law. If you use the codec g729r8 command without the dspfarm-assist keyword, the use of the G.729 codec is preserved only for calls between two phones on the Cisco Unified CME router (such as between an IP phone and another IP phone or between an IP phone and an FXS analog phone). The codec g729r8 command has no affect on a call directed through a VoIP dial peer unless the dspfarm-assist keyword is also used.

For configuration information, see the “a Remote Phone” section.

For information about transcoding behavior when using the G.729r8 codec, see the “Transcoding When a Remote Phone Uses G.729r8” section."

HTH

Manish

[Halsser]

thanks a lot Manish