Lately we are having issues when dialing or transfering 4 digit ext. that begin with 10 or 11. As soon as you input the 10 or 11 a call is attempted but obviously fails because we use 4 digit extensions. The issues are happening on polycom 501 and 430 phones. If you don't pick up the hand reciever and dial any ext. the call will go through, but when the reciever is picked up and you attempt to make a call to an ext starting with 11 or 10 it will attempt to make a call? All transfers fail unless you are dialing to an ext. other then one that begins with 10 or 11.Anyone have any issues related?