Configuration Note   4. Configuring Microsoft Lync Server 2010 
Version 1.0 Issue 1.0  33  October 2011 
10.  Associate a PSTN Usage with this route. In the Associated PSTN Usages 
toolbar, click Select and add the associated PSTN Usage. 
Figure 
 4-24: Associating PSTN Usage with a PSTN Gateway 
 
11.  Click the OK button in the toolbar at the top of the New Voice Route pane.