https://app.knowbase.one/vault/rfc/docid/4633
RFC4240: Basic Network Media Services with SIP
Network Working Group E. Burger, Ed. Request for Comments: 4240 J. Van Dyke Category: Informational A. Spitzer Brooktrout Technology, Inc. ...
https://app.knowbase.one/vault/rfc/docid/6144
RFC5630: The Use of the SIPS URI Scheme in the Session Initiation Protocol (SIP)
Network Working Group F. Audet Request for Comments: 5630 Skype Labs Updates: 3261, 3608 October 2009 Category: Standards Track The Use of the SIPS URI Scheme in the Session I...