http://www.rfc-editor.org/rfc/rfc5049.txt
RFC 5049: Applying Signaling Compression (SigComp) to the Session Initiation Protocol (SIP), C. Bormann, Z. Liu, R. Price, G. Camarillo2007-12-01T23:00:00-00:00This document describes some specifics that apply when Signaling Compression (SigComp) is applied to the Session Initiation Protocol (SIP), such as default minimum values of SigComp parameters, compartment and state management, and a few issues on SigComp over TCP. Any implementation of SigComp for use with SIP must conform to this document and SigComp, and in addition, support the SIP and Session Description Protocol (SDP) static dictionary. [STANDARDS-TRACK]