D.2 Connecting Swyx as a Sub-PBX to a Main PBX
Swyx can also be used as a secondary PBX. An existing sub-telecommunication system is expanded but remains the main telecommunication system.
Fig. D-3: Swyx as a Sub-PBX System
In this case, the SX2 card is connected with the BRI/PRI connection of the main telecommunication system instead of with the PSTN.
Requirements
In the main PBX, a S0/S2mconnection must be available in the main PBX system for connecting Swyx. In the SX2 card, the appropriate BRI/PRI must be available for the connection to the main telecommunication system.
The SX2 card that is used for the connection to the main telecommunication system must be configured in TE mode, i.e. as for the connection to the PSTN.