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Cisco Bug: CSCui92587 - CUBE offers dsp unsupported codec to UAS when UAC doesn't offer codec

Last Modified

Apr 24, 2018

Products (84)

  • Cisco IOS
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco C892FSP Integrated Services Router
  • Cisco 2951 Integrated Services Router
  • Cisco 886VAG 3G Integrated Services Router
  • Cisco 892W Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco 888W Integrated Services Router
  • Cisco C897VA Integrated Services Router
  • Cisco 1905 Serial Integrated Services Router
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Known Affected Releases

15.4(2)T

Description (partial)

Symptom:
CUBE offer dsp unsupported to UAS , eventhough UAC doesn't offer that codec. This issue is seen in both baseline and nitrogen2 image.

Nitrogen2: CUBE is offering "mp4a-latm" codec in the mid-call to UAS, even though mid-call offer from UAC doesn't have the "mp4a-latm" codec which is wrong. In this case, "mp4a-latm" codec doesn't have fmtp attributes as well. 

Baseline: CUBE offers "aacld" codec in the mid-call to UAS, even though mid-call offer from UAC doesn't have "aacld" codec.

Conditions:
NVITE (SDP) --------> | ----INVITE (SDP)-->     
<--18x (rel SDP)------ | <-----18X(rel SDP)   (MP4A-LATM codec is negotiated)
                             | ----PRACK ------->
                             |<----200OK PR------
                             |<---UPDATE (SDP)---
                             | --491-------------> (CUBE is sending this because PRACK/200OK transaction is   
                                                                pending on UAC side)
PRACK ---------------> |                                           
<---200 OK PR --------|

----UPDATE(SDP) -----> | -----UPDATE(SDP)-->  (Here UPDATE from UAC, doesn't have "mp4a-latm" codec, but CUBE still sends "mp4a-latm" codec in the outbound offer that too without fmtp attributes, which is wrong as transcoder is not supported with "mp4a-latm" codec)
                               | <--2OOOK((SDP with mp4a-latm codec). Here CUBE logs displays an IEC error code, and CUBE is not sending any response for UPDATE to the UAC. UPDATE from UAC kept on re-transmitting the UPDATE and the request is timed out)
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