A friend has asked me to hook up an intercom system for him. I was wondering if i could save a little time and see if anyone could suggest a method to implement this? Here is the specs remote room monitor Required: Device must contain a loudspeaker with a microphone alongside switches to disable and control gain (gain control does not have to be exposed to user). If the loudspeaker is enabled, the loudspeaker should amplify and also output audio signal from receive circuit on telephone connection. If the microphone is enabled, the microphone should output an audio signal strong enough to traverse a distance of ~20m without excessive distortion on transmit circuit on telephone connection. Desired: Device shows volume level of received audio signal even when loudspeaker disabled I know a fair bit about microcontrollers and could approach the situation from that stantpoint, but i wondered if there are already pre-existing IC's that i could slap together. Any help is greatly appreciated!