Preview Tool

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

Last Modified

Dec 13, 2018

Products (1)

  • Cisco IOS

Known Affected Releases


Description (partial)

CUBE sends 491 request pending for new dialog request

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.
Bug details contain sensitive information and therefore require a account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.