This is Video #4 of our CUCM series, which is designed to help viewers understand how to configure the features and functionalities of Cisco Unified Communications Manager, or CUCM. The tutorials will be fast paced and it is recommended to repeat the videos several times along with actual practice of the concepts described. This series will be helpful for aspiring CCNA/CCNP Collaboration candidates to prepare for their certification.

In this video, we will discuss how to configure Auto Registration which is a feature that enables IP phones to automatically receive a directory number from the CUCM.



What is Auto Registration?

  • Allows IP Phones to automatically receive a Directory Number from the CUCM.
  • Cisco recommends to use this to add fewer than 100 phones.

Requirements for Auto Registration to Work

  • TFTP server is up and running. If using CUCM as the TFTP server, ensure this service is activated under ‘Cisco Unified Serviceability‘.
  • Load Information specified under ‘Device Defaults’ are present in the TFTP server/ ‘Cisco Unified OS Administration’.
  • The range of numbers to be allocated are available and not in use.
  • There is enough license to support new phones.
  • DHCP Option 150 is pointing to the correct TFTP or CUCM that provides TFTP services.

Auto Registration Configuration Steps

  1. Under System -> Cisco Unified CM specify the Starting and Ending Directory Number.
  2. Add External Phone Number mask if required.
  3. UnCheck ‘Auto-registration disabled’ if checked. Save Configuration
  4. System -> Enterprise Parameters -> Auto Registration Phone Protocol select between SCCP or SIP.