Don't forget MITEL.
http://www.mitel.com/resources/data_...t_21-06-04.pdf This is a listing of interoperability for SIP, but holds some merit towards a 'list' per say. You will want to focus on columns 2 and 3 for the manufacturers.
I am certain you could spend a lifetime trying to get a full compliment as they come and go like MS hotfixes on a Monday. As I come across those not on this list I will update this post.
Cheers [[]]D