asterisk users - Jul 2011 - Using Asterisk as Contact Center: Concurrent Calls + How much time

Hi All;

I am running Asterisk version 1.8.4 and I need to know if I am going to use it
as a call center, and I have up to 6 E1s and about 150 Agents running
concurrently, did anyone test if Asterisk will crash or not? How much it might
be stable? And for how long (number of days or monthes) it will stay up and
running without crash?

Thanks in advance.

Regards
Bilal