Always looking for real world tech experience on system changes. Is there a forum or location that this is discussed? We are looking at a change from Intertel AXXESS.

We have 65 users and a call center, make extensive use of hunt groups, need multiple music on hold options, IVR, custom routing by database lookup, need call recording, call reporting, on screen user interaction (like the netphone), call conferencing for at least 20+, call back queues, etc. Systems currently in consideration:

Shoretel
Mitel 5000
Mitel 3300