SMC Networks Barricade SMC7908VoWBRA2 - Manual (Page 113)

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VoIP Extensions
You can configure the Line and Phone port settings on this screen.
Parameter Description
Telephony Tone Country Setting Configures telephony tone set for the selected
country.
Extension Number Select Extension Number to assign to the
phone. This should be your VoIP phone
number. The extension number selected will
be the default number used for making
outgoing calls. You will also be able to receive
phone calls for this number.
Additional Number: Select an additional number to assign to the
phone. This could be your PSTN number
(Select PSTN) or a secondary VoIP account.
Assigning an additional number allows you to
receive phone calls for this number. By default
outgoing calls are via the extension number.
However in the event calling is not possible via
the extension number, the call will be routed
via this number.