What provides number-based call analysis?

• A. CDR
• B. RADIUS
• C. SIP Trace
• D. MIB

Answer: (C)

When you want to understand how a call uses specific numbers, you need visibility into the signaling that transports those digits. SIP Trace captures the SIP signaling exchanged between devices, including the Request-URI that carries the dialed number, the From/To headers, and the exact sequence of SIP messages (INVITE, trying, ringing, OK, ACK, etc.). This lets you see, in real time, which numbers were dialed, how the call was routed, and where any routing or signaling issues occurred. That level of detail is what enables precise number-based analysis of call setups and flows.

CDR focuses on post-call details like duration and parties after the fact, not the live signaling containing the numbers themselves; RADIUS is about user authentication and accounting, not call-number analysis; MIB deals with device management data. So for tracing and analyzing the numbers involved in calls, SIP Trace provides the most direct and actionable visibility.