Reverse DTMF Dialer is the same like Auto Dialer but it have capability to send DTMF digits on call. You can set your DTMF Digits, it can be an IPRN Number or any other digits to respond on call.
Using Reverse DTMF Dialer you can call an Access Number and then you can supply your IPRN Number to it as DTMF, so your access number dial that number and your call got connected. This access number can be a calling card number, or an office phone that supports dial through DTMF.