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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)

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.

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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