Support Services - Wireshark: What do the SIP Request Methods Mean

1 min

  • INVITE: Indicates a client is being invited to participate in a call session.

  • ACK: Confirms that the client has received a final response to an INVITE request.

  • BYE: Terminates a call and can be sent by either side of the call.

  • CANCEL: Cancels any pending request.

  • OPTIONS: Queries the capabilities of servers.

  • REGISTER: Registers the address listed in the To Header field with a SIP server.

  • PRACK: Provisional acknowledgement.

  • SUBSCRIBE: Subscribes for an Event of Notification from the Notifier.

  • NOTIFY: Notify the subscriber of a new Event.

  • PUBLISH: Publishes an event to the Server.

  • INFO: Sends mid-session information that does not modify the session state.

  • REFER: Asks recipient to issue SIP request (call transfer.)

  • MESSAGE: Transports instant messages using SIP.

  • UPDATE: Modifies the state of a session without changing the state of the dialog.

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