Over the years, I have worked a lot with Polycom Lync phones, SNOM IP phones and Aastra/Mitel Phones.
All the years I have been using DHCP options and this has been a great and nice to work with.
Well, now it has been just a bit more simple.
We got a GUI for this now and it can be downloaded from here. There are also information about it here:
Great tool to make your day easier.