I recently replaced an AT&T T1 with an MCI PRI circuit (Opt. 11 25.40) and have had lots of framing errors. The circuit has also dropped a couple of times. MCI is telling me to check the protocol on my route to make sure it matches their switch type (which is a DMS500). I've been instructed by my vendor that the interface should be set to NI2 on the route (which it is) but I'm still getting slips. I dont' even see any option in the NTP that matches DMS500. Is there anything else I need to check? I appreciate your assistance.