Use this handy utility, Modem Spy to record all phone all phone calls. It is a utility which can record from microphone and also playback recorded messages via phone line or sound card.
    With this tool, you can accomplish many tasks like you can record messages from microphone like Dictaphone. You can order it to Record ALL phone calls automatically and even phone conversations. This feature will be of help to you if you are a internet shopper. You can record all your sale conversations and never get cheated on the price. It has many other useful features like; built-in automatic gain control software, one click email sending with attached record, detect and log Caller ID, super spy option for stealth recording and optional answering machine mode; and many others. This software also has a very easy to use interface. The recorded conversations can be utilized effectively by sending it through email and also can convert your records to any voice format liker MP3, WAV, etc.
    The size of this program is very small, therefore it wont take up much space on your computer.