We are moving from a Nortel PBX front end to a full call manager 5.1(2)system. We are now planning the provisioning of the DSPs for the 3845 Gateway routers and we are trying to estimate the number of concurrent conference calls we may have in our office. The number of end users is 340 and there are six PRI's. Two of the six PRI's are dedicated to Long Distance service only. Any guidance would be greatly appreciated.