From version 2.3 you can set outgoing calls as audio-only if they are as a result of audio-only incoming calls. Use the API to set the request parameter audioGatewayCallOptimization to “true” on the /callProfile object.
Setting audioGatewayCallOptimization to "true" affects:
- incoming SIP or Lync calls resulting in outgoing SIP calls
- incoming SIP or Lync calls resulting in outgoing Lync calls
- incoming SIP or Lync calls to an IVR that trigger participation in a Lync conference
Using this feature prevents the Cisco Meeting Server from generating audio and video streams on outgoing call legs when the received incoming call has audio-only call legs. The reduction in unused video streams will potentially reduce the loading on the Cisco Meeting Server and the AVMCU.
Note: The outgoing call leg will remain audio-only, even if the incoming call leg later changes to audio and video.
Note: This feature requires ‘early offer’ enabled on Cisco Unified Communications Manager deployments. Deployments using ‘delayed offer’ will still send video on the Lync leg of the call, as a result of the Cisco Meeting Server not knowing that the call is audio only until after the call is established.