https://app.knowbase.one/vault/rfc/docid/4629
RFC4237: Voice Messaging Directory Service
Network Working Group G. Vaudreuil Request for Comments: 4237 Lucent Technologies Category: Standards Track October 2005 Voice Messaging Directory Service Status of This Memo...
https://app.knowbase.one/vault/rfc/docid/7484
RFC6871: Session Description Protocol (SDP) Media Capabilities Negotiation
Internet Engineering Task Force (IETF) R. Gilman Request for Comments: 6871 Independent Updates: 5939 R. Even Category: Standards Track Huawei Technologies IS...