I have an 81c with point to point PRIs connecting to a 61c. All call traffic goes through the 81c to reach the 61c by CDP DSC. When a call for the 61c is received and the caller wants to be transferred to someone on the 81c the call will not "connect". The person on the 61c will press transfer and dial a number, the person will answer, she will then press the "connect" key but nothing happens. This was working fine. It has just flared up? Thanks!