Hello, I am looking for a phone system that integrate well with a (almost) 100% Microsoft.

I would like something that can integrate with Exchange and Active Directory (in-phone searching/calling by name (is this possible using SIP ?), etc) and if possible something not too expensive (Bye bye Cisco !), what do you recommend me ? I've heard of 3CX as IPBX and Aastra as Phones, are they good for this ? Or do you know something else good at this ?

I've also seen some Alcatel IP Phones doing this (search by name, but I think that was a separated address book and not loaded from AD/Exchange)

Thank you !