Controlling media of ongoing calls with just a SIP Proxy
summary
Shows how OpenSIPS 3.1 can add media features (music-on-hold, announcements, PIN prompts, call recording/listening, whispering, temporary barge-in) without acting as a media endpoint. It explains using the new Media Exchange module to manipulate RTP streams by exchanging SDP between SIP sessions so media is mixed or re-routed while keeping the original SIP signalling path through the proxy.
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