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Cisco Bug: CSCum81041 - ASR1K CUBE fails to send negotiated media after mid-call codec change

Last Modified

Nov 27, 2020

Products (2)

  • Cisco 2600 Series Multiservice Platforms
  • Cisco 2600 Series Multiservice Platforms

Known Affected Releases

15.3(3)S1

Description (partial)

Symptom:
One way audio incoming calls redirected through CVP.

Conditions:
Call flow:
------------
 
Caller----G711----TDM GW----SIP-----ASR1K----SIP-----CUSP----SIP----CVP(Vz0)----IP-IVR
                                                                                                   |
                                                                                                   | -----SIP---CVP (BAMS)
                                                                                                   |
                                                                                                   |--------SIP---CUCM---Agent Phone (G729 only)


Initially the caller is connected to IP-IVR, both ingress and egress leg of the CUBE is doing G711. Call is connected to the IP-IVR, then CVP sends a refer to the VXML GW for playing prompts and ringback tone etc. When the call is transferred to the agent, CUBE negotiated G729 at the sip level with the CVP, but because of mid-call signalling block on the ingress side, continue with the G711. Hence xcoder is invoked on the CUBE to handle G729 to G711 and vise versa, but CUBE is still sending G711 media to the agent phone side while the agent phone is sending G729 media to the CUBE.
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