In this post, we will configure the unassigned numbers feature of Lync Server 2010. We will create announcements for Singapore Site, and another number for the executive number range that transfers the call to the operator. Then configure unassigned numbers for the sites, including one that is specific to the executive number range.
In the Lync Server Management Shell, type the following command, and then press Enter:
New-CSAnnouncement –Name “Singapore Unassigned Number Announcement” -TextToSpeechPrompt “The number you have called is currently out of service. Check the number and try your call again.” –Language “en-US” –Identity “service:ApplicationServer:pool01.theunify.net” –Verbose
In the Lync Server Management Shell, type the following command, and then press Enter:
New-CSAnnouncement –Name “Executive Unassigned Number Announcement” –TextToSpeechPrompt “This person’s phone number has changed. You will now be transferred to the operator.” –Language “en-US” –Identity “service:ApplicationServer:pool01.theunify.net” –TargetURI “sip:+6531525569@theunify.net;user=phone” –Verbose
Next we create an Unassigned Number range.
In the Lync Server Control Panel, click Voice Features.
Click the Unassigned Number tab, and then click New.
On the New Unassigned Number Range page, in the Name box, type Singapore Internal Numbers. First Number range box, type tel:+6531525500. In the second Number range box, type tel:+6531525599.
Leave Announcement selected in the Announcement service drop-down list. Next to FQDN of destination server, click Select.
In the Select an Announcement Service window, click ApplicationServer:pool01.theunify.net, and then click OK.
Under Announcement, click Singapore Unassigned Number Announcement from the drop-down list, and then click OK.
On the Unassigned Number tab, click New. On the New Unassigned Number Range page, in the Name box, type Executive Numbers. The first Number range box, type tel:+6531525600. The second Number range box, type tel:+6531525699.
Leave Announcement selected in the Announcement service drop-down list. Next to FQDN of destination server, click Select.
In the Select an Announcement Service window, click ApplicationServer:pool01.theunify.net, and then click OK.
Under Announcement, click Executive Unassigned Number Announcement from the drop-down list, and then click OK.
On the Unassigned Number tab, click Commit All.
Next post, we will assign the number to the users.

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Hey David
This is Denny, the creator of this free automated employee
provisioning/termination app– Z-hire. I wrote this app for the TechNet community a year ago.
Since you run a very informative blog, I would like your help
spread the word. Since my application is free, i need supporters from the
community. It would means a lot if you can help.
Here is a link to my app
http://gallery.technet.microsoft.com/Z-Hire-Employee-Provisionin-e4854d6b
Thanks
Denny
how can I help?
Have you tried using a target URI of a response group ? Also, have you gotten announcements to work when the calling number is PSTN sourced ?
Yes,
you facing any issue?