We elected to trial one office upgrade with a new phone system, on much different technology than myself or my colleagues are used to. We decided to go with a Fonality system. The support seems great, the product is very advanced, and the price is VERY good. We are doing our first SIP turnup and phone system install in the Paris office this weekend. I hope it goes well. If this works out we'll be rolling out Fonality across the company over time. Munich is next on the list.
It's essentially a modified asterix system. Fonality also manages the development of Trixbox, which is the largest distribution of Asterix on the market. Looking forward to seeing it in action!
Really amazing features and I like the fact that we can use almost any supported phone provider. (Cisco, Polycom, Grandstream, Aastra)
Fonality PBXtra - http://pbxtra.fonality.com/