We present Ambient Pre-Communication for always-on tele-communication systems. It allows the Caller to feel more comfortable in initiating communication, as comfortable as in the real world. To start communication in the real world, determining the appropriate voice volume is essential. However, existing tele-communication systems fail to support the Caller in controlling voice volume because the systems don't provide feedback of the Caller's voice at the Receiver's site. Our proposal allows existing tele-communication systems to provide visual feedback. The key idea is to superimpose a ripple-peak-meter, which represents the sound field at the Receiver's site, on the Receiver's video signal. The Caller can control his/her voice volume using the ripple-peak-meter. We describe a prototype system and experiments in which we observed the Caller's response to the ripple-peak-meter display. The proposed method allows the Caller to easily grasp and control the volume of his/her voice at the Receiver's site and encourages him/her in commencing tele-communication.