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Cisco Bug: CSCvi54164 - CUBE incorrectly sends 491 request pending when initial dialogue is complete

Last Modified

Sep 26, 2018

Products (1)

  • Cisco IOS

Known Affected Releases

15.6(3)M1

Description (partial)

Symptom:
CUBE sends 491 request pending for new dialog request

Conditions:
CUBE call flow involving TCL script which is configured to answer UAS leg before UAC leg is initiated.  TCL script sends 100 trying/180 ringing/200 OK response for initial INVITE on UAS leg.  Script then initiates transfer by sending INVITE on UAC portion.  Issue is seen when a re-invite is received on UAS leg before 200 OK received on UAC leg, CUBE sends 491 request pending which is incorrect per SIP RFC 3261:

21.4.27 491 Request Pending

   The request was received by a UAS that had a pending request within
   the same dialog

As dialog had already been completed on UAS portion, 491 response is not correct here.
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