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What is PUBLISH Request Extension Method in SIP?

PUBLISH is used by a user agent to send event state information to a server known as an event state compositor.

1. A PUBLISH request is related to a NOTIFY, except that it is not sent in a dialog.

2. A PUBLISH request must have an Expires header field and a Min-Expires header field.

3. PUBLISH is largely useful when there are multiple sources of event information.

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