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For the following reasons, you may see Unidentified Caller in the Lync conversation window:
The user you have called has a bridged extension.
Your call went to a voice mail system. If your call is answered by a voice mail system, the voice mail system appears as Unidentified Caller.
Your call went to Music-On-Hold by way of a Voice Announcement with LAN (VAL) board on Communication Manager, causing you to lose telephone control on your Lync. You can resolve this issue by upgrading Communication Manager with Service Pack 12866.
You manually entered a number in the FIND box that was not in the proper format. If you are manually typing the number in the FIND box, be sure to enter the full telephone number, including the country code and either the area code or the region code, whichever is appropriate. Depending on how the system has been administered, it may be acceptable to not include the country code in the entered number. In all cases, you should not include the Automatic Route Selection (ARS) code for the outside line, for example, 9.