I have a Norstar that had a 24 channel T1. They use FEATURE 900 to charge calls. We recently replaced the T1 with a PRI and now they no longer can use FEAT 900. We are being told that they can't use FEAT 900 with a PRI, that we have to put a regular T1 in instead. Can someone confirm this for me? My norstar knowledge is extremely limited. Thank you.