Hello everyone, I got complains from users that they cannot input access codes over the phone for systems such as bank automated systems or conference access codes. For example, one user said when inputting a four digits access code for conference the number 8 doesn't work, however when dialing a telephone number no problem. I change the phone unit but it seems to not help. i also check to see if there is any jitter in my t1s which is fiber but they seemed good. Does anyone run across this problem?