How to use the D928 Dual Phone Module with PBX and Standard Phone Lines.
- Both lines must have an identical method of reaching an outside line, either requiring a 9 to dial first or having direct access. The D928 must be able to swap connection to the control panel between the primary and secondary phone lines. The control panel will dial phone numbers programmed in Phone Parameters by way of which ever phone line is connected to the panel at a given time.