FREE SIP Protocol Fundamentals Questions and Answers

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Which SIP method is used to request information about the capabilities of a SIP endpoint?

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The OPTIONS method is used to query a SIP endpoint about its capabilities and supported methods without initiating a call or session. This helps determine what features or services the endpoint can handle.

What does a SIP response code of 180 Ringing indicate?

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A 180 Ringing response indicates that the SIP endpoint has received the INVITE request and is in the process of alerting the user, meaning the phone is ringing or similar action is being taken.

Which SIP header identifies the unique identifier for a particular SIP transaction or call?

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The Call-ID header provides a unique identifier for a specific SIP call or transaction. This ID helps differentiate between multiple calls and track them across the SIP network.

What is the correct order of the main components in a SIP message?

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In a SIP message, the Request Line (or Status Line in responses) comes first, followed by the headers, and then the optional body. This order is standard for both SIP requests and responses.

Which component of a SIP transaction is responsible for maintaining state between a client request and the server response?

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A SIP Dialog maintains state between a client request and server response, managing the communication session and ensuring continuity and proper routing of SIP messages throughout the session.