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What is SUBSCRIBE Request Extension Method?
SUBSCRIBE is used by user agents to begin a subscription for the purpose of getting notification about a special event.
1. SUBSCRIBE request has a time period in the Expires header field that shows the desired duration of existence of a subscription.
2. After the specified time period passes, the subscription is automatically ended.
3. A successful subscription begins a basic call flow between the user agents.
4. A subscription can be recharged by sending another SUBSCRIBE within the dialog before the expiration time.
5. The server accepting a subscription returns a 200 OK.
6. Clients can unsubscribe by sending another SUBSCRIBE method with Expires value 0 (zero).
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