Desktop videoconferencing typically consists of a camera that videotapes each participant, compresses the sound and images, sends them through a network such as the Internet or a phone line, and decompresses them at the other end. A basic analog connection is suitable for videoconferencing with long-time clients or employees and in situations where there's no need to impress. Some models let you edit documents with other users. The Kodak DVC323 includes software that allows you to add still and video pictures, such as graphs or sketches, to your videoconferencing sessions. An ISDN line may also be required, as well as a USB port.
Some manufacturers provide speakers with their models.
Intel's ProShare Video System, however, requires no speakers. 3Com's Bigpicture Video Phone has a built-in microphone. If a microphone isn't supplied, you can usually use any microphone that's compatible with your sound card. One feature to check when choosing a videoconferencing system is frame rate. The higher the frame rate, the crisper and more lifelike the on-screen image.