I have a client with MICS 7.1 AND 2 PRI's. The client recently changed telcos for one of the PRI's and now they are having trouble with stuttering connections and ring no answer and can't call out. The new telco says it's due to a faulty clocking card. But would that not affect both PRI's? Has anyone even heard of a DTI and/or clocking card failing? (even partially?)