VoIP

Tips

Voice-Related RFCs
RFC 3856 - A Presence Event Package for the Session Initiation Protocol
RFC 3262 Reliability of Provisional Responses in the Session Initiation Protocol
- 临时响应的可靠传输
- RFC4028 的不足与 SIP KEEP-ALIVE 方法
RFC 4028 - Session Timers in the Session Initiation Protocol
- 会话刷新
RFC 3261 SIP: Session Initiation Protocol
- https://tools.ietf.org/html/rfc3261
- 定义了使用 OPTIONS 来检测状态
  - asterisk 中的 qualify
RFC 2833 - RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals
- https://tools.ietf.org/html/rfc2833
RFC 4733 - RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals
- 替代 RFC 2833
- https://tools.ietf.org/html/rfc4733
RFC 6913 - Indicating Fax over IP Capability in the Session Initiation Protocol (SIP)
- https://tools.ietf.org/html/rfc6913