Hi, I don't know if this sounds naive, but I haven't been able to configure an MCS 7835 to receive calls. I've got it to be able to make, transfer, pick-up and so forth. BUT I can't receive any ringing, but when I dial the number (my PRI has only 1 number) it rings, but I don't see it in any of the sets. Please help. Will trade for Nortel Norstar, Meridian and Passport advice if necesary. Thanks in advance!