Soundwin VoIP Voice Gateway User Manual page 66

Termination Trunk: Setting the Proxy service Port, default port is 5060.
This SVR can route the calls to terminate gateway for call termination.
8. If you want to set Dialing Rule for Call Routing, select "Outgoing Dial Rule" option.
Outgoing Dial Rule Setting: SVR can register to another one ITSP Proxy Server for call
international calls to save the call cost.
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