I work a lot with Lync Enterprise Voice projects. A typical challenge in these projects are assigning numbers to users, know which number is assigned to what user and make sure you have full control of all services having a number. There are a total of 9 possible entities in Lync Server 2013 that can get a number assigned.
Together with Lasse Wedø I created a blog dedicated to number management in Lync. There we talk about some of the scripts we created, quick tips and reviews of third party tools that does number management
At Lync Conference 2014 and TechEd North America 2014 I talked about Phone Number Management in Lync Server 2013. There was a lot of interest in the topic and number management is becoming a real challenge since we see more and more organizations moving to Lync as their only Phone system nationwide and globally. Check out lyncnumbers.net for some real world tips