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Caution: Each of the Phone ports can be connected to an analog phone only. Do not
connect the phone ports to the telephone wall jack. Such connection might damage your
router.
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ISDN1/2 port is configurable as NT or TE mode. When the user configures ISDN port as
NT mode in IP PBX>>PBX System>>Phone Settings, the orange LED will light on to
indicate ISDN-NT is selected. And by using ISDN phone adapters (coming from the
router package), the user can connect several phones to the router for communication.
Refer to the following figure for reference.
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