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.
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