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SIP Request Messages
- INVITE RFC 3261
- REGISTER RFC 3261
- BYE RFC 3261
- ACK RFC 3261
- CANCEL RFC 3261
- OPTIONS RFC 3261
- REFER 2 RFC 3515
- SUBSCRIBE 5 RFC 3265
- NOTIFY 5 RFC 3265
- MESSAGE 13 RFC 3428
- INFO 16 RFC 2976
- PRACK 17 RFC 3262
- UPDATE 18 RFC 3311