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What is INVITE Request Core Method in SIP?

INVITE is used to start a call session with a client or signals a client is being invited to participate in a session. That is to say, an INVITE method is used to begin a media session among the user agents.

1. INVITE contains the media data of the caller in the message body.

2. Session is considered started if an INVITE has received a success response (2xx) or an ACK has been sent.

3. A successful INVITE request sets up a dialog between the two user s which proceeds until a BYE is sent to stop the session.

4. Re-INVITE occurs when an INVITE has been sent within a launched dialog.

5. Re-INVITE is used to modify the session features or refresh the state of a dialog.

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