https://app.knowbase.one/vault/rfc/docid/7944
RFC7315: Private Header (P-Header) Extensions to the Session Initiation Protocol (SIP) for the 3GPP
Internet Engineering Task Force (IETF) R. Jesske Request for Comments: 7315 Deutsche Telekom Obsoletes: 3455 K. Drage Category: Informational Alcatel-Lucent IS...