Yes it will record phone calls if properly connected, although the quality of the recording is not as good as the call itself.The problem is that once I connected it to the phone tone dialing was disabled. So with this little gem in-line I couldn't even dial the number i wanted to reach. I had to use a wireless phone on the same line to dial the number and get through all the "Press 1 if..." prompts. I tried this on both my wired phone with the same result - no tone dialing.