https://app.knowbase.one/vault/rfc/docid/6553
RFC6026: Correct Transaction Handling for 2xx Responses to Session Initiation Protocol (SIP) INVITE Requests
Internet Engineering Task Force (IETF) R. Sparks Request for Comments: 6026 Tekelec Updates: 3261 T. Zourzouvillys Category: Standards Track Skype IS...