SIP

SIP=Session Initiation Protocol=会话发起协议
- SIP代理
- 消息类型
  - Requests
    - INVITE
    - ACK
    - REFER
    - OPTIONS
    - BYE
    - CANCEL
    - REGISTER
    - SUBSCRIBE
    - NOTIFY
    - MESSAGE
  - Responses
    - Success
    - Redirection
    - Forwarding
    - Request failure
    - Server failure
    - Global failure

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