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Cisco Bug: CSCta75923 - CMM Transcoder re-uses SSRC during call transfer, strips Mark bits

Last Modified

Jan 28, 2017

Products (1)

  • Cisco Catalyst 6000 Series Switches

Known Affected Releases

12.4(15)T9

Description (partial)

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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  • Status
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