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Cisco Bug: CSCuo59806 - CUE is not responding with video m line

Last Modified

May 14, 2019

Products (1)

  • Cisco Unity Express

Known Affected Releases


Description (partial)

Video Enabled IP phone----(SCCP)---CME----(SIP)----CUE

CUE is not responding with video m line, which leads to RTP port leak on CME. This is not following RFC.

As per RFC 3264, "For each "m=" line in the offer, there MUST be a corresponding "m=" line in the answer.  The answer MUST contain exactly the same number of "m=" lines as the offer.  This allows for streams to be matched up based on their order.  This implies that if the offer contained zero "m=" lines, the answer MUST contain zero "m=" lines."

Video Enabled IP phone----(SCCP)---CME----(SIP)----CUE
Issue happens when the IP phone is enabled with video and invite to CUE contains video m line in addition to audio m line.
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