TELTEC BlueBox pro, Инструкция по установке и эксплуатации

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3.5 Call duration limitation
To be able to maintain control over the telephone charges, BlueBox
pro enables you to adjust its call duration limit. It is set to 30
minutes by default.
Before the time runs out, the BlueBox pro will give an audible
warning that the connection is going to be broken. These warnings
will be given at 30, 20, 10, 5, 4, 3, 2 and 1 seconds before the final
disconnection.
You can set a limit from 1 to 99 minutes or completely disable this
feature.
Example: Disconnection after 15 minutes
Pick up the receiver or push the handsfree key. You will hear a
sound created by your telephone system.
Dial the number of your extension line you connected the Blue Box
pro to. The BlueBox pro will answer after the second ring and send
3 sounds.
Enter the programming code *794#15#
After entering the second “#” you will hear an acknowledgement
signal.
Put the receiver down or push the handsfree key a second time to
finish programming. The feature is now programmed.
Programme the time limit to “0”, if you want to disable this feature.