List of SIP request methods

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SIP requests are the codes used by Session Initiation Protocol for communication. To complement them there are SIP responses, which generally indicate whether this request succeeded or failed, and in the latter case, why it failed.

SIP requests
Request name Description Defined in
INVITE Indicates a client is being invited to participate in a call session. RFC 3261
ACK Confirms that the client has received a final response to an INVITE request. RFC 3261
BYE Terminates a call and can be sent by either the caller or the callee. RFC 3261
CANCEL Cancels any pending request. RFC 3261
OPTIONS Queries the capabilities of servers. RFC 3261
REGISTER Registers the address listed in the To header field with a SIP server. RFC 3261
PRACK Provisional acknowledgement. RFC 3262
SUBSCRIBE Subscribes for an Event of Notification from the Notifier. RFC 6665
NOTIFY Notify the subscriber of a new Event. RFC 6665
PUBLISH Publishes an event to the Server. RFC 3903
INFO Sends mid-session information that does not modify the session state. RFC 6086
REFER Asks recipient to issue SIP request (call transfer.) RFC 3515
MESSAGE Transports instant messages using SIP. RFC 3428
UPDATE Modifies the state of a session without changing the state of the dialog. RFC 3311