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Enable contact lookup by phone number

To allow users in your environment to lookup contacts using their phone number, use the
Microsoft Active Directory
schema MMC snap-in to index and enable ANR for the applicable phone attributes.
The phone number must be in a supported format. For a list of supported formats, see Searching for users by phone number.
  1. Click the
    Attributes
    folder in the snap-in.
  2. In the right panel, right-click the desired attribute, and then click
    Properties
    .
  3. Select the
    Index this attribute
    check box.
  4. Select the
    Ambiguous Name Resolution (ANR)
    check box.
  5. Click
    OK
    .
  6. If you have multiple phone attributes, repeat steps 2 to 5 for each attribute.