Snom ONE IP, Техническое руководство

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Deploying the snom ONE IP Telephone System
504
Table B-2 Non-RFC 3261 Methods
SIP Method Description RFC
PRACK Provisional acknowledgement 3262
SUBSCRIBE Subscribes for an Event of Notification from the notifier 3265
NOTIFY Notifies the subscriber of a new event 3265
PUBLISH Publishes an event to the server 3903
INFO Sends mid-session information that does not modify the
session state
2976
REFER Asks the recipient to issue a SIP request (call transfer) 3515
MESSAGE Transports instant messages using SIP 3428
UPDATE Modifies the state of a session without changing the state
of the dialog
3311
Responses are sent from the server to the client and are used to indicate the status of the
transaction. Responses are delivered in integer form (from 100 to 699) and are catego-
rized as shown in Table B-3.
Table B-3 Categories of Response Codes
1xx Informational responses
2xx Success responses
3xx Redirection responses
4xx Request failures
5xx Server errors
6xx Global failures