What tools troubleshoot endpoint registration?

• A. Ping and traceroute
• B. CUCM RTMT logs/traces, endpoint status pages, and packet captures
• C. Endpoint GUI configuration only
• D. Phone reboots

Answer: (B)

The key idea is that diagnosing endpoint registration relies on collecting and analyzing detailed diagnostic data from the system, viewing the endpoint’s current registration status, and inspecting the actual signaling between the endpoint and the registrar. CUCM RTMT logs and traces provide time-stamped records of registration attempts, errors, and protocol exchanges (SIP/RAS), so you can see exactly where the process is failing. The endpoint status pages give a quick, real-time view of whether a device is registered and to which server, helping you determine if the issue is isolated or widespread. Packet captures let you inspect the live signaling to identify root causes such as authentication failures, DNS or SRV resolution problems, TLS certificate issues, or clock skew affecting certificate validation.

Ping and traceroute only test basic network reachability and don’t reveal registration handshakes or codec-level issues. Endpoint GUI configuration might point to a misconfiguration, but it doesn’t provide the diagnostic details needed to understand why registration is failing. Rebooting the phone may fix transient glitches, but it doesn’t diagnose the underlying cause.

Using these tools together gives a complete picture of registration problems, from the server side through the device’s signaling to the actual registration outcome.