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Hi @Duong Phan,¿Can you share the detailed view of INVITE and ACK SDP message?¿Also share a little more info? ¿Is it a new deploy? ¿which is each endpoint (rm, sipserver,mcp,agent,recorder, etc)? ¿call flow?¿it happen always? ¿new carrier or old one? etc, etc.As far I known, on SIP signaling, CN could be "Comfort Noise", could be an endpoint set to make use of it. More info:
https://tools.ietf.org/tools/rfcmarkup/rfcmarkup.cgi?rfc=3389https://docs.genesys.com/Documentation/Options/Current/GVP/GVP_MCP-mpchttps://docs.genesys.com/Special:Repository/Genesys400SeriesIPPhone228Administrators.pdf?id=76090a5b-1bb6-4bea-b798-47b1b739ae8e&page=Documentation%2FGPHTry to revise the messaging in the INVITE and ACK SDP signals to check what were the endpoint negotiate between them.Perhaps, it could help you.
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