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2 Telephones for the Global Marketplace
DEFINITY ProLogix Solutions Release 2 Overview
555-235-100 Issue 2 June 1999 2-16
ISDN BRI Telephones
Like the digital DCP telephones, ISDN telephones transmit voice, data, and control signals digitally. With
the ISDN telephones, however, the transmission employs the world-wide standard BRI protocol between the
switch and the telephone. The TN556C BRI station card permits the use of 8500 Series ISDN telephones.
Also like the DCP telephones, these telephones can be used with personal computers to expand their digital
capabilities. The DEFINITY ISDN BRI telephones include models that have unique features such as call
logs and personal directories.
8500 Series ISDN
BRI Telephones
The 8500 Series telephones are multiline ISDN BRI telephones.
The following models of 8500 Series telephones are available:
• 8503T ISDN BRI telephone
The 8503T ISDN BRI telephone is ideal for staff workers, entry-level associates,
lobbies, and conference rooms. This telephone provides three buttons for call
appearances/flexible features, nine fixed feature buttons, and 12 programmable
memory-dialing locations on the dialpad keys. The 8503T can support a S201A
speakerphone or a 500A headset adapter and can be wall mounted.
• 8510T ISDN BRI telephone
The 8510T ISDN BRI telephone is an all-around, multi-purpose, mid-range
telephone that provides a full array of features for very active telephone users and
busy managers, allowing quick and easy access to switch and personal features.
This telephone is ideal for the majority of your staff, conference rooms, and small
office/home office environments.