I have a partner plus 4.0 with 3 2x6 3.1e cards.the cordless phones i have hook up to the system stop ringing.I tested it with my buttset, and fround out none of the 3 cards have enough ring gen to ring my buttset. Is it the processor or the 2x6 cards . I tested the 2x6 cards 1 at a time, and still not enough ring gen to ring the phones.there is some ring gen. the fax machine on the system will pickup a call.