CVP Codec support

[amir.ayub]

What is the role of Codec with respect to CVP in UCCE deployement with SIP as signalling protocol. Is it for playing media files or setting the codec for RTP between Gateway and IP Phone.

Regards,

Amir Ayub

[Amer rajai Sha'er]

Hello,

The call is accepted by the CVP before it goes to the agent , so the gateway and the CVP will decide the codec before going to the agent , with SIP the codec is G.711 .

The media files are cached from the media server , it could be the same as the call server or it could be different .

When the call is transfered to agent , if the agent is in a different location than the CVP (G.711) a transcoding should be implemented .

Amer

[geoff]

The call is accepted by the CVP before it goes to the agent , so the gateway and the CVP will decide the codec before going to the agent , with SIP the codec is G.711 .

It can be G.729

When the call is transfered to agent , if the agent is in a different location than the CVP (G.711) a transcoding should be implemented .

Not so. The call can be extended as G.729 without transcoding.

Flat codecs can be easier to handle than mixed codecs. There can be complex transfer cases in mixed codecs that cause problems. If you don't use ASR/TTS, you could definitely consider a flat G.729 codec for your deployment.

Regards,

Geoff

[Irfan Tariq Javed]

CVP supports mixed G.711 and G.729 codecs in Standalone and Comprehensive SIP deployments withCisco Unified Border Element Enterprise Edition (CUBE) and Cisco Unified Communications Manager(Unified CM). Calls that are ingressed through a SIP trunk from the carrier to a CUBE require IOS15.1(2)T or later T for mixed codec support. You can use any combination of codecs on the legs of a call.

Benefits and drawbacks for G.711 codec include:

• You do not have to convert prompts to G.729
• However, the solution requires significantly more bandwidth over the WAN link.

Benefits and drawbacks for G.729 codec include:

• No extra bandwidth is required.
• You must convert all prompts to G.729
• G.729 prompts have an inferior audio quality to G.711 prompts
• ASR/TTS cannot be used.