4.3 Directory URIs and IP Phones

This topic describes how directory URIs are assigned to an IP phone.

  • An IP phone registers each line with its directory number.
  • Directory URIs can be associated with a directory number as follows:
    1. One directory URI per primary extension of an end user
      • Manually configured at the end user configuration page
      • Synchronized via LDAP
    2. Up to five directory URIs, configured at the directory number configuration page
  • One directory URI per directory number is the primary URI.
    1. End user-based URI (if configured) is always primary.
    2. If no end-user-based URI exists, one of the directory URIs configured at the directory number page is configured as primary.
    3. Primary directory URI is used as the calling-party directory number on outbound calls.

Each phone that registers with Cisco Unified Communications Manager registers all of its directory numbers.

Directory URIs can be associated with directory numbers in three different ways:

  • Manually configured at the End User Configuration page: One directory URI can be configured at the End User Configuration page. The end user must be associated with a device and the primary extension of the device must be selected. As a result, the configured directory URI is associated with the directory number that is selected as the primary extension for the end user.
  • Synchronized via LDAP: When a user is provisioned via LDAP, one directory URI can be imported from LDAP. The Directory URI field in the Cisco Unified Communications Manager end user configuration can be populated with either the Microsoft Active Directory msRTCSIP- primaryuseraddress field or the mail field during LDAP synchronization. As with manually configured directory URIs, the imported end user must be associated with a device and the primary extension of the device must be selected. The directory URI can be associated with the corresponding directory number only when the primary extension of the end user is set.
  • Manually associated with a directory number: At the Directory Number Configuration page, up to five directory URIs can be associated with the directory number.

One directory URI per directory number functions as the primary directory URI. A directory URI that is configured for an end user always becomes the primary directory URI of the primary extension of the end user. If no end-user-based directory URI exists, you can select which of the directory URIs that are configured at the Directory Number Configuration page should be the primary directory URI. By default, the first directory URI that is configured at the Directory Number Configuration page is the primary URI.

The primary URI is used as the calling URI on outbound calls.