In this case, for example, an existing PBX system is operated as a sub-PBX under Swyx. Swyx manages access to the public telephone network and other networks. The sub-PBX is connected to Swyx via ISDN. The ISDN cards provided for this must be operated in NT mode in this case.

See D.1 Swyx as the Primary PBX.

In this case, for example, an existing PBX is operated as the master PBX. Swyx is connected to them as a sub-PBX. A prerequisite for this is the subsystem capability of the existing telecommunication system. The access to the public network is managed by the existing telecommunication system

See D.2 Connecting Swyx as a Sub-PBX to a Main PBX.

In this case, Swyx is operated alongside an existing PBX system. Both systems have access to the public telephone network and/or other networks.

See D.3 Swyx alongside another system with additional access to the public network.