SIP request messages
There are several types of message requests. SIP is transactional, communicating through requests and replies. The most important types of requests are described in the following table:
|
Message |
Description |
RFC |
|---|---|---|
|
ACK |
Acknowledges an INVITE |
RFC 3261 |
|
BYE |
Terminates an existing session |
RFC 3261 |
|
CANCEL |
Cancels a pending registration |
RFC 3261 |
|
INFO |
Provides mid-call signaling information |
RFC 2976 |
|
INVITE |
Session establishment |
RFC 3261 |
|
MESSAGE |
Instant message transport |
RFC 3428 |
|
NOTIFY |
Sends information after subscribing |
RFC 3265 |
|
PRACK |
Acknowledges a provisional response |
RFC 3262 |
|
PUBLISH |
Uploads the status information to the server |
RFC 3903 |
|
REFER |
Asks another UA to act on Uniform Resource Identifier (URI ... |
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