A call can be routed via a SIP provider to another SIP client or to a number on the conventional telephone network.

The parameters required to log onto a SIP provider are configured for a trunk group. During logon, the SwyxLinkManager registers the SIP trunk with the SIP provider in order to have telephone communication with a SIP client directly via an IP route.

This registration is repeated regularly as long as the SIP provider does not have any other default settings.

When calling a SIP client (this can be a terminal device or a software-based telephony system), the call will be routed to the desired client via the SIP provider. As part of this process, the SwyxLinkManager is responsible for the transmission of the logon information and the voice data as well as for the creation and termination of the connection. The voice data are routed directly to the SIP client without being routed via the SIP provider.

If this SIP link calls a number in the public telephone network (PSTN), the call will first be routed to the SIP provider via the IP route and goes from there to the appropriate phone number via the public network.