This scenario includes two locations, London (A) and Liverpool (B). An ISDN trunk to the local public network is installed at both locations. Furthermore, both locations have a SIP trunk to a SIP provider. The two locations are also connected directly via a SwyxLink trunk connection on a VPN.

When calls are made from London (A), the system should attempt to dial into the Liverpool location (B) and the local public network in Liverpool (C) first via the SwyxLink trunk connection. Thereafter, it should attempt to dial in via the SIP trunk and the public network (ISDN).

Internal calls should also be routed via the SwyxLink trunk connection.