Cisco Bug: CSCuo59806 - CUE is not responding with video m line
May 14, 2019
- Cisco Unity Express
Known Affected Releases
Symptom: 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." Conditions: 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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