I think the uc500 it's too expensive for very small installations (less that 16 users let's say).
Once you sum uc500 price, phones and the greedy licenses, it's not cheap by any means.
You estimate to customers, 500 euros per user, in most cases they are not willing to spend that. PBX market is very competitive, so for smaller situations we're proposing Linksys LVS now. The phones are even nicer and cheaper.
The situations gets better as you go up with number of users. Above 50 or so, using an ISR router, you can't beat CME.
Lucky now cisco has introduced decent layer 2 switches with PoE in the 2960 line and that has solved another pricing difficulty too.
May be we're going toward a world of cme telephony and we'll be able to tell it's being used, by the slightly stuttered moh when we're waiting for someone - btw the "popolar sip server" stuttering in serving moh is much more pronounced!
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