I am experiencing random issues with the DTMF that is being sent on a Partner ACS R7 V1. Sporatically on different phones you can dial the same outside number and 20% of the calls will get a message from the carrier that the number was dialed incorrectly. I am trying to find out if this could be an issue with the DTMF being sent. Is there a tone card built into the processor or the expansion cards. This sytem is using all 206E's for the additional stations. Any suggestions on how to troubleshoot or diagnose if this is a hardware issue?