Deutsche Telekom 704PC - Manual (Page 80)

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Configuring the System
Settings
Here you can edit your communications system settings. These settings apply to all
connected devices.
Menu: Central data
Please note
In order for messages waiting in your T-NetBox to be indicated, the ISDN "MWI"
service must be available for your ISDN connection.
For the latest details of this service, please contact your T-Punkt or Customer
Service department on 0800 33 01000.
Only messages to the telephone number configured as MSN 1 can be signalled.