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Cisco Bug: CSCvu67527 - CVP is changing SDP Origin/sess-version field for 180 Ringing and 200 OK

Last Modified

Oct 20, 2021

Products (1)

  • Cisco Unified Customer Voice Portal

Known Affected Releases

12.0(1) 12.5(1)

Description (partial)

CVP in call director mode
pstn--e1 -- VGW--->CUCM-->SBC-->CVP->ICM--CVP--SBC-->Thirdparty ACD like Avaya

When the call is delievered to a thirdparty agent and agent phone is ringing, ACD will send a series of 180 Ringing messages to CVP, which CVP will forward to Ingress PSTN.

It is observed that CVP is changing the version number in O field of 180 Ringing and 200 OK messages.

The 180 ringing messages received and forwarded by CVP to Ingress

   o=Cisco-CVP-B2BUA 289844526 289844527 IN IP4 x.x.x.x
   o=Cisco-CVP-B2BUA 289844526 289844528 IN IP4 x.x.x.x
   o=Cisco-CVP-B2BUA 289844526 289844529 IN IP4 x.x.x.x

As per RFC, CVP should not change the version number in O field when acting as a proxy.
This change in SDP leads to additional re-invites from Ingress causing further race conditions on CVP.

CVP working as a proxy
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