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Cisco Bug: CSCup14659 - VCS IWF script modifies the SDP payload order

Last Modified

Apr 10, 2018

Products (3)

  • Cisco TelePresence Video Communication Server (VCS)
  • Cisco TelePresence Video Communication Server Model
  • Cisco Expressway

Known Affected Releases

X8.1.1

Description (partial)

Symptom:
VCS IWF script modifies the rtp payload order while replying with 200 OK to an INVITE

Conditions:
When the VCS does the SIP to H323 interworking it modifies the order of the payload type under the SDP while replying.

as per RFC 3264 https://www.ietf.org/rfc/rfc3264.txt section 6.1 

Although the answerer MAY list the formats in their desired order of preference, it is RECOMMENDED that unless there is a specific reason, the answerer list formats in the same relative order they were present in the offer.  In other words, if a stream in the offer lists audio codecs 8, 22 and 48, in that order, and the answerer only supports codecs 8 and 48, it is RECOMMENDED that, if the answerer has no reason to change it, the ordering of codecs in the answer be 8,48, and not 48, 8.  This helps assure that the same codec is used in both directions.
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