I have recently installed an IP403 with PRI and an analogue trunk module. Whenever I try to dial out over the analogue trunk thru the premicell I get distorted or no speech. The premicell works fine when not connected to the IPO. I have heard (can't remember where) that the IPO will not support both PRI and analogue in the same unit. I am running ver 2.0 on the IPO and have no other issues with it.