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Before Your Begin
Parts Checklist
Make sure your package includes the items shown here.
Connections and Setup
Telephone Jack RequirementsTo use this phone, you will need an RJ11C (for a single
line) or a RJ14C (for two lines) type modular phone jack, which might look like the one
pictured here, installed in your home or oce. If you don’t have either modular jack, call
your local phone company to nd out how to get one installed.
VERY IMPORTANT: In order to achieve full system operation (i.e. intercom, page, etc.), Line
1 must be connected and must be common to all phones connected to the system. Only
other 25420, 25423, 25424, 25425, 25413, 25414, 25415, 25403 and 25404 models are
compatible for full system operation. Connecting phones other than the 25420, 25423,
25424, 25425, 25413, 25414, 25415, 25403 and 25404 to Line 1 may inhibit the intercom
and paging operations.
For proper operation of intercom, page function, etc., DO NOT connect a DSL modem to
Line 1. To transfer a call from one station to another, the two stations
should be connected to the same line.
Important Installation Information
• Never install telephone wiring during a lightning storm.
• Never install telephone jacks in wet locations unless the jack is specically designed
for wet locations.
• Never touch non-insulated telephone wires or terminals, unless the telephone line
has been disconnected at the network interface.
• Use caution when installing or modifying telephone lines.
• Temporarily disconnect any equipment connected to the phone such as faxes, other
phones or modems.