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Cisco Bug: CSCum03790 - CUBE views outgoing SDP content-length size inaccurately

Last Modified

Apr 24, 2020

Products (9)

  • Cisco IOS
  • Cisco 7301 Router
  • Cisco 7206 Router
  • Cisco 7204 Router
  • Cisco 7206VXR Router
  • Cisco 7202 Router
  • Cisco 7200 Series NPE-G2 Network Processing Engine
  • Cisco 7204VXR Router
  • Cisco 7201 Router

Known Affected Releases

15.1(4)M6.10 15.2(4)M

Description (partial)

Symptom:
Immediately after the 200 OK is sent in response to the Re-Invite the ITSP sends a BYE as they expected the origin version id to increment.  The lack of incrementation cause the call to be torn down by the ITSP.

Conditions:
This problem was observed in the following scenarios :

 - Switchover from voice to fax
 - Change in codec for voice calls

SDP content-length size is different in initial outgoing Invite to perform call setup than it is in 200 OK response  to an inbound Re-Invite which causes the origin (o=) version in the SDP not to increment.  CUBE however sees the content-length sizes as the same size.

Previous SDP content-length was 250, 399 was the current SDP content-length:

SIP/Info/sipSPICheckForSDPModification: prev send SDP size = 399, curr send SDP size = 399

SIP/Info/sipSPICheckForSDPModification: prev send SDP and curr send SDP are  same

/SIP/Info/sipSPIHandleSDPOwnerVersionIDChange: SDP owner_version ID not incremented ..
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