SIP Requests
The following table lists the SIP requests.
Table A–1 SIP Request Methods|
SIP Request |
Description |
|---|---|
|
INVITE |
A client is being invited to participate in a call. |
|
ACK |
The client has confirmed the INVITE request. |
|
BYE |
The call has been terminated by either the caller or callee. |
|
CANCEL |
Cancel any pending requests. |
|
OPTIONS |
Queries the server for its capabilities. |
|
REGISTER |
Registers the client with the server according to the address in the To header. |
|
PRACK |
Similar to ACK, but a provisional confirmation. |
|
SUBSCRIBE |
Subscribes the device for an event notification. |
|
NOTIFY |
Notifies all subscribers of an event. |
|
PUBLISH |
Publishes an event to a server. |
|
INFO |
Sends information in the middle of a session that doesn't modify the session's state. |
|
REFER |
Asks the client to issue a SIP request, typically a call transfer. |
|
MESSAGE |
Sends an instant message using SIP. |
|
UPDATE |
Modifies a session's state without altering the dialog state. |
For a list of all SIP requests and links to their definitions in their respective RFCs, see the SIP requests Wikipedia entry.
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