| This page is maintained by Paul E. Jones. |
| RFC 2543 | SIP: Session Initiation Protocol (obsolete) |
| RFC 3261 | SIP: Session Initiation Protocol |
| RFC 1847 | Security Multiparts for MIME: Multipart/Signed and Multipart/Encrypted |
| RFC 2045 | MIME Part One: Format of Internet Message Bodies |
| RFC 2046 | MIME Part Two: Media Types |
| RFC 2047 | MIME Part Three: Message Header Extensions for Non-ASCII Text |
| RFC 2048 | MIME Part Four: Registration Procedures |
| RFC 2633 | S/MIME Version 3 Message Specification |
| RFC 3204 | MIME media types for ISUP and QSIG Objects |
| RFC 3420 | Internet Media Type message/sipfrag |
| RFC 3555 | MIME Type Registration of RTP Payload Formats |
