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Cisco Bug: CSCvs92171 - CUBE-ENT does not reply '200 OK' to 'PRACK/sdp' SIP messages

Last Modified

Aug 29, 2020

Products (14)

  • Cisco IOS
  • Cisco ASR 1000 Series IOS XE SD-WAN
  • Cisco 4221 Integrated Services Router
  • Cisco 4331 Integrated Services Router
  • Cisco 4321 Integrated Services Router
  • Cisco ASR 1002-X Router
  • Cisco ASR 1001-X Router
  • Cisco 4351 Integrated Services Router
  • Cisco ISR 4000 Series IOS XE SD-WAN
  • Cisco ASR 1002-HX Router
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Known Affected Releases

16.9.3

Description (partial)

Symptom:
CUBE does not reply to a PRACK with SDP preceeded by 180 Ringing and 183 Session Progress.

Call flow:
UAC -- sip (100rel enabled) -- CUBE --- UAS

Message flow:

    INVITE from UAC passed to the UAS
    UAS sends 180. CUBE sends 180 with 100 rel
    UAC responds with PRACK and no SDP. CUBE responds with 200 OK
    UAS responds with 183 SP. CUBE sends 183 with 100 rel to UAC
    UAC responds with PRACK and no SDP. CUBE responds with 200 OK
    UAS responds with 183 SP. CUBE sends 183 with 100 rel to UAC
    UAC responds with PRACK and SDP.
    CUBE does not respond to the PRACK with 200 OK.
    200 OK arrives from UAS. CUBE responds to UAS with ACK.
    CUBE passes 200 OK for INVITE to UAC.

This is incorrect behavior as the UAC expects 200 OK for the PRACK first before 200 OK for INVITE.

Conditions:
- CUBE sends 183/180 with 'Rel1xx' required. 
- PRACK with sdp coming as response
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Bug Details Include

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