With the Off-Premises Station feature, you can connect a telephone that is located in a different building than the server that runs Communication Manager to your system.

If you use central office (CO) trunk circuits, the telephone must be:

• Analog

• FCC registered, if the telephone is in the United States

• Registered by the appropriate governmental agency, if the telephone is located outside the United States

You can use digital communications protocol (DCP) sets as off-premises telephones if you add IP Softphone or IP Office. You can set up IP stations as off-premise stations if you use point-to-point protocol (PPP) connections. DS1 trunk service provides a digital interface for off-premises stations.

A trunk-data module connects off-premises private-line trunk facilities and Communication Manager. The trunk-data module converts between the RS-232C and the DCP, and can connect to Direct Distance Dialing (DDD) modems as the DCP member of a modem pool.

Off-Premises Station requires cross-connecting capabilities, and one port on an analog line or a DS1 tie trunk media module for each interface that you want to provide. Not all analog lines can support an off-premises station. For more information, see the user guide for the appropriate telephone.

The maximum loop distance for off-premises stations is 20,000 feet (6093.34 meters) if you do not use repeaters. For information about the cable distance, see the user guide for the appropriate telephone.

Note that the system does not support the use of a message waiting indicator lamp (MWI) on an off-premises station.