FEATURES GUIDE

General Features
138 Features Guide
Integrated Services Digital Network (ISDN) Service
Access
Description
Allows you to access a service which is provided by ISDN.
Conditions
• To use the ISDN service button on a digital proprietary telephone, you must first assign a
flexible button as the ISDN service button.
• Make sure to press the ISDN service button after seizing a CO line. Otherwise a reorder tone
will be heard.
Programming Guide References
No programming required.
Features Guide References
None
User Manual References
• 2.2.7 Integrated Services Digital Network (ISDN) Service Access