All call Intercom systems distribute the voice throughout the room stations all at once. This is done by activating the talk button from the room station. These systems usually do not allow the end user to select the room station to communicate. The only way to select a room station for private call will be from the master unit only.
Selective Call or Automatic Selective Call
A selective call Home Intercom system allows the end user to selective a room station to communicate privately between room stations. This is done by dialing the room station by number. Some programming maybe required. An automatic selective call Home Intercom system allows the end user to talk privately between room stations. But the end user does not dial a selected room station. The automatic selective call initiates as an All Call once the talk button pressed. Once the call is answered from another room stations all the other room stations will go back to original settings and the call is now private.
Music Distribution from a Home Intercom System
Home Intercom systems are the most cost effective way of getting music distribution throughout your home without spending a fortune. Most music distribution systems for a 4 or 5 bedroom home will cost between $2500 to $5000 and Home Intercom systems can start as little as $1200 depending how many rooms will have music. Choosing where to locate each room station is not just for intercom functions but also for music distribution. Make sure you have good coverage for your music. Most of the room stations have a 3 inch speaker for music. Because of the small size of the speaker you will not be able to turn up the music very loud without getting distortion. Ask your manufacture if they are able to upgrade your sound to a ceiling speaker. With ceiling speakers you will get better music coverage especially in larger rooms. Also check with your manufacture and take advantage of ipods or mp3 players and hook it up to your system directly.