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What is the main purpose of the SIP 'REGISTER' method?

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Register a user with a SIP server

The primary purpose of the SIP 'REGISTER' method is to register a user with a SIP server. When a user agent (such as a SIP phone or soft client) wants to communicate over a SIP network, it needs to inform the SIP server of its address and availability. The 'REGISTER' method accomplishes this by sending information about the user agent’s contact details and its current status to the server. This registration allows the SIP server to know where to send incoming calls or messages directed to that user.

Once registered, the SIP server can manage routing requests, keeping track of where the user is located and ensuring communication is established effectively. This functionality is essential for SIP networks, as it enables users to be reachable regardless of their current IP address or device.

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