A vPBX server manages calls in a bridged line appearance group. The apparatus is equipped to playback, control and display imagery according to the size and the shape of one or more pixelated material segments making up the video-displaying apparel. The voice processing system further has a second interface for receiving telephone calls from an internet protocol network, and a signaling subsystem for routing an IP call from the second interface to the application software. This process of detection of the time differences is repeated several times while changing the rotational phase of the an image carrying member for the second color. If the interval is larger than the threshold, then the site is a responder and the atrioventricular delay of the implantable device may be set to less than the intrinsic atrioventricular delay of the patient.