Many PBX and key system suppliers provide lower priced home type or proprietary 900 MHz wireless phones (Fig. 43.8). The phones only work within range of the antenna in the phone and the phone's base unit. The 900 MHz phones have a range of about 125 to 150 feet depending on building conditions. There also is an upper limit of about 20 cordless phones supported in the same building.

Proprietary cordless phones have features powered by the phone system to which they are connected. These features, voice mail message lights, multiple call appearances and hold buttons, make the phones easier to use and more functional. In building wireless phones are used for the following personnel who often use headsets with their ...

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