Boy now I'm not sure what I have loaded on my 2620xm, I'll have to fire up the lab tomorrow. Looks like if you get the 12.4(24)T it will manage, but I'd probably just get an 1841 if you haven't already purchased the router.
Looked at the basic few routers I got in a lab bundle, just found out one of then has CME 4.1 on it, not sure how I missed that til now.
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May need to upgrade memory, run at least 12.4 IOS, and going to need some extra hardware to really get it going.
looking at Cisco Unified CME and Cisco IOS Software Version Compatibility Matrix [Cisco Unified Communications Manager Express] - Cisco Systems
will 2620 be able to support 7.X CME ?
Solaris Forum
Looked at the basic few routers I got in a lab bundle, just found out one of then has CME 4.1 on it, not sure how I missed that til now.
I'll report back if noone else chimes in.