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Cisco Bug: CSCuq05240 - CUBE consumes Reinvite when m=audio line has more than 1 codec

Last Modified

Nov 07, 2016

Products (87)

  • Cisco IOS
  • Cisco 881SRSTW Integrated Services Router
  • Cisco 2951 Integrated Services Router
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco 861W Integrated Services Router
  • Cisco 892W Integrated Services Router
  • Cisco 888W Integrated Services Router
  • Cisco 1905 Serial Integrated Services Router
  • Cisco C892FSP Integrated Services Router
  • Cisco C897VA Integrated Services Router
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Known Affected Releases

15.2(4)M2

Description (partial)

Symptom:
When G711ulaw is negotiated end to end and a midcall codec change occurs to change from G711ulaw to g729r8, the Reinvite sent to the CUBE is not passed through to the external UAC (ITSP).  

When this occurs the CUBE consumes the Reinvite and replies with a 200 OK (with the m=audio line seen below) allowing for the negotiation of G729r8:

m=audio port RTP/AVP 18 101

This failure to pass through the Reinvite only occurs when the Reinvite contains more than one codec in the m=audio line.  If the Reinvite contains the following m=audio line the CUBE passes the Reinvite to the external UAC (ITSP) and G729r8 is then negotiated end to end:

m=audio port RTP/AVP 18 101

Conditions:
This occurs when CUCM parameters are changed to allow for 64k rather than 8k to be used between regions and the codec preference list in CUCM is modified to prefer G729r8 above G711ulaw.  These changes generate a m=audio line with the following contents in the midcall Reinvite sent to the CUBE:

m=audio port RTP/AVP 18 0 116 8 101   <-----------multiple codecs

The command "midcall-signaling passthru media-change" is also in place on the CUBE.
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