| RFC 2976 | The SIP INFO Method |
| RFC 2848 | Extensions for IP Access to Telephone Call Services |
| RFC 3050 | CGI for SIP |
| RFC 3262 | Reliability of Provisional Responses |
| RFC 3263 | Locating SIP Servers |
| RFC 3265 | SIP-Specific Event Notification |
| RFC 3311 | 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 SIP |
| RFC 3324 | Short Term Requirements for Network Asserted Identity |
| RFC 3325 | Private Extensions to SIP for Asserted Identity within Trusted Networks |
| RFC 3326 | The Reason Header Field |
| RFC 3327 | Extension Header Field for Registering Non-Adjacent Contacts |
| RFC 3329 | Security Mechanism Agreement |
| RFC 3361 | DHCP-for-IPv4 Option for SIP Servers |
| RFC 3372 | SIP for Telephones (SIP-T): Context and Architectures |
| RFC 3398 | ISUP to SIP Mapping |
| RFC 3428 | SIP Extension for Instant Messaging |
| RFC 3455 | Private Header Extensions for 3GPP |
| RFC 3515 | The Session Initiation Protocol (SIP) Refer Method |
| RFC 3608 | Extension Header Field for Service Route Discovery During Registration |
| RFC 3680 | SIP Event Package for Registrations |
| RFC 3840 | Indicating User Agent Capabilities in SIP |
| RFC 3841 | Caller Preferences for SIP |
| RFC 3842 | Message Summary and Message Waiting Indication Event Package |
| RFC 3856 | Presence Event Package |
| RFC 3857 | A Watcher Information Event Template-Package |
| RFC 3903 | Event State Publication |
| RFC 3959 | Early Session Disposition Type |
| RFC 3960 | Early Media and Ringing Tone Generation |
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