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Question: 1 / 485

Which of these is NOT a valid SIP request method?

NOTIFY

ACK

TRANSMIT

The correct option, which is not a valid SIP (Session Initiation Protocol) request method, is TRANSMIT. SIP is used for initiating, maintaining, and terminating real-time sessions that involve video, voice, messaging, and other communications. The protocol defines several request methods, including:

- NOTIFY: Utilized to provide information about changes in state or subscriptions.

- ACK: Acknowledges the receipt of a response to a previous request, often used in the context of confirming session establishment.

- BYE: Used to terminate a session or a call.

TRANSMIT, however, is not recognized as a method within SIP specifications. This distinction is crucial for understanding the functions and capabilities of SIP and maintaining effective communication protocols.

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BYE

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