Oracle Communications Session Border Controller — Question 4

How does the SIP registrar server maintain the registered user’s information in its database?

Answer options

• A. by querying a DNS server
• B. by querying an ENUM server
• C. by creating a registration cache entry, which is an association between a layer 3 IP address and the User Agent (UA) Via address
• D. by creating a location record, which is an association between the Call-ID and the User Agent (UA) Contact address
• E. by creating a binding, which is an association between a globally unique SIP URI and the User Agent (UA) Contact address

Correct answer: D

Explanation

The correct answer is D because a location record is specifically used to associate the Call-ID with the User Agent's Contact address, which is essential for SIP communication. The other options describe different mechanisms or associations that do not accurately represent how the SIP registrar stores registered user information.