D.3 Swyx alongside another system with additional access to the public network
You can also configure a Swyx system installed as a secondary PBX to have its own direct connection to the public network or other networks, such as a SIP link or a SwyxLink.
Fig. D-4: Swyx as a secondary PBX with its own access to the PSTN
The lines necessary for this, e.g. from an additional SX2 card, must then be connected to the public telephone network and configured appropriately for the direct connection to the PSTN (15.2.6 Installation of the software for the ISDN card).
In this scenario, various ISDN trunk groups are set up:
*ISDN trunk group(s) for access to the other telecommunication system
*ISDN trunk group(s) for access to the public network
*further trunk groups (e.g. SIP or SwyxLink) for access to other networks
The forwarding table determines how calls are forwarded in such a scenario (14 Routing).
 
Please ensure that the permissions with which calls are forwarded are carefully configured.