I am with you, but they did not ask us. They had an agent for AT+T sell them an IP flex which is IP to a cisco router, and they said it can only support PRI to the PBX. . I doubt this but that is the situation. The PBX only supports T1. So there is my dilemma. They bought an Atlas 550 and I am not comfortable with all the programming on the Atlas. The dial plan has me somewhat unsure.