I have read some posts where people have had problems recognizing DTMF on analog style trunks. Some have installed patches, some adjusted CO Loss to Short. I have a new CP150 2.1 and I have a DTI Card for my trunks. The EXACT PROBLEM is low DTMF sensitivity. Callers will call in and dial ** to access their mailboxes and it will not recognize all of the digits. I have had them call in from a land line and it seems to work OK. On many voice mails you can adjust the sensitivity to compensate for Cell Phones. Their OLD DOS AMANDA voice mail did not have this issue so it is hard to say, it's your cell phones. I have checked ALL of their cell phones and only 2 were on Short DTMF, that has now been changed but still the same problem. Any idea would be greatly appreciated.