https://app.knowbase.one/vault/rfc/docid/132
RFC8858: Indicating Exclusive Support of RTP and RTP Control Protocol (RTCP) Multiplexing Using the Session Description Protocol (SDP)
Internet Engineering Task Force (IETF) C. Holmberg Request for Comments: 8858 Ericsson Updates: 5761 January 2021 Category: Standards Track ISS...