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Wednesday, March 16, 2016

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What is NOTIFY Request Extension Method in SIP?

Leke Oyetoke - Wednesday, March 16, 2016


What is NOTIFY Request Extension Method in SIP?


NOTIFY is used by user agents to express the occurrence of a special event. A NOTIFY is always sent within a dialog when a subscription exists amid the subscriber and the notifier.

1. A 200 OK response is received for every NOTIFY to specify that it has been received.

2. NOTIFY requests contain hold an Event header field specifying the package and a subscription-state header field showing the current state of the subscription.

3. A NOTIFY is always sent at the beginning of a subscription and at the end of a subscription.


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