Section 5. Troubleshooting Endpoint Registration

The Unified Communication Manager is responsible for registration and call routing for end devices, such as IP phones. In this section, we discuss how to troubleshoot registration issues with Skinny Client Control Protocol (SCCP) and SIP endpoints.

SCCP/SIP

Understanding the boot process of the IP phone is invaluable to the resolution of any registration issues. By knowing the steps an IP phone takes during registration, you can quickly isolate and resolve many issues:

  1. The phone receives power.
  2. The stored phone image is loaded.
  3. The voice VLAN is configured via Cisco Discovery Protocol or by hard setting on the phone.
  4. The IP address is assigned, and option 150 is learned for the TFTP address.

Get CCNP Voice TVoice 642-427 Quick Reference now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.

Start your free trial