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Cisco Bug: CSCun38059 - Mid-call codec change causes no-way audio issues on transcoded CUBE call

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:
No way audio (Silence) issue is noticed on transcoded SIP-SIP calls on CUBE after mid-call codec change.

Conditions:
IOS Relase 15.3(3)M1 and above

Issue happens only under following condition.

1. Transcoder is allocated on CUBE for DTMF Interworking (Audio Codec Used on both inleg and outleg are same)

2. Due to supplementary services like "Hold" or "Transfer", one of the call leg negotiates different audio codec (Since the transcoder already allocated for DTMF interworking, it takes care of audio transcoding)

3. Later when the call is "Retrived" or "Transfer" is completed, both the call legs on CUBE negotiates same audio codec and transcoder needs to be updated for DTMF Interworking. At this point, CUBE fails to update transcoder causing no-way audio issues
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