Cisco Bug: CSCta75923 - CMM Transcoder re-uses SSRC during call transfer, strips Mark bits
Jan 28, 2017
- Cisco Catalyst 6000 Series Switches
Known Affected Releases
Symptoms: One-way voice may occur after a transfer through a CMM transcoder if the stream goes through an RTP-aware firewall such as an ASA. The transcoder in some transfer situations will reuse a previous SSRC, which causes a security violation. Conditions: In a situation where there are 3 SSRCs in a single transfer, the outgoing stream from the transcoder will reuse the first SSRC in place of the third SSRC. This is against the RTP RFC, and some firewalls may drop the packet. Some gateways and endpoints may also not correctly process the packets, depending on the strictness of the RFC implemented.
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Bug Details Include
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