Log on to the computer as a member of the RTCUniversalServerAdmins group, or as a member of the CsVoiceAdministrator, CsServerAdministrator, or CsAdministrator role. For details, see Delegate Setup Permissions.

Open a browser window, and then enter the Admin URL to open the Lync Server Control Panel. For details about the different methods you can use to start Lync Server Control Panel, see Open Lync Server Administrative Tools.

In the left navigation bar, click Voice Features and then click Unassigned Number.

On the Unassigned Number page, in the search field, type all or part of the name of the unassigned number range you want to change.

In the list of number ranges, click the name you want, click Edit, and then click Show details.

In the first Number range field, type the beginning number of the range, and in the second Number range field, type the ending number of the range.

Note:

The beginning number of the range must be less than or equal to the ending number of the range. If the beginning number of the range or the ending number of the range includes an extension number, both the beginning number and the ending number of the range must include an extension, and the extension number must be the same for both the beginning number and the ending number. The number must match the regular expression (tel:)?(\+)?[1-9]\d{0,17}(;ext=[1-9]\d{0,9})?. This means the number may begin with the string tel: (if you don’t specify that string it will be automatically added for you), a plus sign (+), and a digit 1 through 9. The phone number can be up to 17 digits and may be followed by an extension in the format ;ext= followed by the extension number.

In Announcement service, do one of the following:

• Click Announcement.
  
  
• Click Exchange UM.
  
  

If, in the previous step, you clicked Announcement, do the following:

1. Under FQDN of destination server, click Select, click the service ID of the Application service that runs the Announcement application that will handle incoming calls to this range of unassigned numbers, and then click OK.
   
   
2. In Announcement, click the announcement to be played for this range of unassigned numbers.
   
   

If, in the previous step, you clicked Exchange UM, under Auto Attendant phone number, click Select, click the phone number to be used for this range of unassigned numbers, and then click OK.

Click OK.

On the Unassigned Number page, make sure that the unassigned number ranges are arranged in the order you want. To change a range's position in the table, click one or more consecutive names in the list of ranges, and then click the up arrow or down arrow.

Tip:
Lync Server 2010 searches the unassigned number table from top to bottom and uses the first range that matches the unassigned number. If you have a range that specifies a last resort action, make sure that range is at the bottom of the list.

When you have the unassigned number ranges in the order you want, click Commit all.