Technical data

A.5 Why do I need Internal Phone Numbers? 162
A.3.4 Check List 2: Configuration of Devices
• Check all cables connected to the devices.
• Check whether NTBA and all devices are connected to their
power supplies. If you want to connect more than 4 devices,
the additional devices will need their own power supplies.
• Check the settings of the devices: D-channel protocol (DSS1)
- MSN (in-/out-bound) - Service settings (e.g. in a PBX) -
Depending on the device additional settings may be required,
e.g. Password, software version, transmission protocol.
If the fault still remains, please contact manufacturer or distirbu-
tor of the device.
A.4 How to make an internal call
For an internal call always dial * * (asterix) as prefix.
Combination Device Connection / Internal MSN
* * 1 1 Analog 1 Port 1
* * 1 2 Analog 2 Port 2
* * 2 1 bis 2 4 ISDN 1 – ISDN 4 MSN 21 – MSN 24
A.5 Why do I need Internal Phone Numbers?
Using internal phone numbers you may have calls to the internal
phones free of charge.