和SIP有关的RFC:
RFC 2543 SIP: Session Initiation Protocol
RFC 2848 The PINT Service Protocol: Extensions to SIP and SDP for IP Access to Telephone Call Services
RFC 2976 The SIP INFO Method
RFC 3050 Common Gateway Interface for SIP
RFC 3087 Control of Service Context using SIP Request-URI.
RFC 3261 SIP: Session Initiation Protocol
RFC 3262 Reliability of Provisional Responses in the SIP
RFC 3263 Session Initiation Protocol (SIP): Locating SIP Servers
RFC 3265 Session Initiation Protocol (SIP)-Specific Event Notification
RFC 3311 The Session Initiation Protocol (SIP) UPDATE Method
RFC 3312 Integration of Resource Management and SIP
RFC 3313 Private SIP Extensions for Media Authorization
RFC 3319 DHCPv6 Options for SIP Servers
RFC 3323 A Privacy Mechanism for the Session Initiation Protocol (SIP)
RFC 3325 Private Extensions to SIP for Asserted Identity within Trusted Networks
RFC 3326 The Reason Header Field for the Session Initiation Protocol (SIP)
RFC 3327 SIP Extension Header Field for Registering Non-Adjacent Contacts
RFC 3329 Security Mechanism Agreement for SIP
RFC 3351 User Requirements for the S