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Wireless IAD User Manual
122
PSTN Control
PSTN means Public Switched Telephone Network. It is one kind of telephone
system which uses the copper cable to transmit analog sound. PSTN is also known
as POTS (Plain Old Telephone System).
This page allows you to change the prefix digits to dial one PSTN phone call. If your
device is on the PSTN mode, it is not necessary for you to set the prefix digits for the
PSTN phone calls.
Conditions for the PSTN
The following conditions indicate that the VoIP phone has been changed to PSTN
mode:
z while the IAD is powered off
z while the IAD cannot register with or reach the SIP Server
z while user dials prefix digits
z while user dials PSTN phone numbers including emergency call (FXO function,
refer to the section of “Definition of FXS and FXO”)
z while PSTN call incoming
Conditions for the VoIP
The following conditions indicate that the VoIP phone has been changed to VoIP
mode:
z while PSTN call terminated
z while SIP sever is reachable and is registered successfully
Note: Only Phone 1 port can act as a PSTN relay. So if the wireless IAD
loses power only Phone1 can make calls using your landline telephone
company
The page on the right side is the web
page for PSTN control settings.