This 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.