和SIP有关的RFC:RFC 2543 SIP: Session Initiation ProtocolRFC 2848 The PINT Service Protocol: Extensions to SIP and SDP for IP Access to Telephone Call ServicesRFC 2976 The SIP INFO MethodRFC 3050 Common Gateway Interface for SIPRFC 3087 Control of Service Context using SIP Request-URI.RFC 3261 SIP: Sessi Read More