AON is a program for automatic determination of phone number (will work in Ukraine, Russian Federation and other countries where CCITT R1 standard without intervals between code frequencies is used). It does not work with modem, just connect phone line to sound card by simple device. The device circuit can be found in AON help.

AON can help you to extract phone number from sound file where phone conversation is recorded. In this mode DTMF tones can be determined.