Looking for an app for Mac to paste in telephone number then the app will convert to DTMF tones. This will be sent over my USB 56k Fax Modem to landline connection.
There is a DTMF encoder/decoder, but it's platform is Windows only which means that you have to use another app that can run Windows software on Mac without the Windows OS to be installed. The app's name is Wine Bottler and it has been successfull at launching various Windows Apps on Mac.