Frequently Ask Questions Q: How does an intercom system work? A: In general, a residential intercom has two normal functions, (1) To page another person for short information conversations. For instance, "John you are wanted on the phone." " Okay, I'll be right there." (2) Monitoring a room to make it easier to move around the home and still be able to monitor the activities in that room. More advanced systems have become popular as a result of added features such as music distribution, door chimes, more versatility and better overall performance.     Q: I have an older model intercom system. Can I replace just the master unit and keep my room stations? A: No. Technology has changed so much through the years that older speakers simply cannot function with the more advanced technology of today's master units.     Q: Can I monitor from my intercom? A: Yes. All M&S intercom systems have monitoring capability. M&S intercom systems can monitor one room into the rest of the house, or the rest of the house into one room, or any combination in between.     Q: Can I talk from room to room? A: Yes, but keep in mind that most residential systems are "all call" systems (i.e. when you speak into one speaker your voice travels to all other speakers that are turned "on" throughout the home).     Q: Can I select which rooms hear the radio? A: Yes. Most of the systems have room control switches that enable you to select various functions for each remote speaker. On those systems without individual room control switches, you simply turn the volume control on the desired speaker from full volume to "zero."