Cisco Bug: CSCvi54164 - CUBE incorrectly sends 491 request pending when initial dialogue is complete
Jun 18, 2018
- Cisco IOS
Known Affected Releases
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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