Check programming and ensure that under "PRIMARY CENTRAL STATION", the option for "CS" has an entry of 7 for "MODEM II FORMAT" and both options "ACK 14" and "ACK 23" have an entry of "NO".
Check programming and ensure that under "PRIMARY CENTRAL STATION", the option for "CS" has an entry of 7 for "MODEM II FORMAT" and both options "ACK 14" and "ACK 23" have an entry of "NO".