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Internet Gate's telephone ports allow you to:
Phone ports are marked PH1, PH2 on the back panel of the Internet Gate, and LINE for connection to the global telephone network.
Connect a telephone to the FXS port to make ordinary or SIP calls. It is possible to connect up to 5 phones to each FXS port. The two phone ports allows you to have two different registrations (phone numbers).
FXS1 controls port PH1, FXS2 controls port PH2.