Handsfree: This feature enables you to press a button, let go, and then talk to a person at another station without having to hold a button down. The Panasonic VL-GM201A Video Intercom System has this capability.

Memory: The Cyrex HFX-800M video intercom system has a built-in live video function that provides a date and time stamp to show you who was at your door even when you are not home. You can pop out the its memory cartridge and copy the video to your computer. It's a little bit like a security camera attached to a digital video recorder.

Video Monitor: This feature allows you to monitor anything around the door phone camera. You’ll press a Monitor button and the camera will activate without alerting anyone by the camera. Using this feature you can check on the kids playing in the yard, check so see who is at the front door even if they don’t press the call button on your door phone, or observe the area if you suspect vandalism or some other crime. The Panasonic Video Door Phone is one unit that has this capability.

Music: The larger, more expensive intercom systems have the capability of playing music over all the stations. So if you don't have your house wired for whole house sound this is one way to do it. The sound won't be stereo hi-fi, but it's better than no music at all. The NuTone music intercom is one system that has this capability.

Electric Door Opener: If you add an optional electric door opener to a door phone, most systems will let you press a button to unlock the door remotely. The WireFree system has this capability wireless intercom system has this capability.

Door Phone Night Vision: Many video door phone systems use infrared LEDs to provide a picture on the inside monitor even at night. If the system has a color LCD, it will switch to a black and white image at night. The Cyrex CHF-650  has this capability.