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Ext Key - D-Link DPH-400S User Manual

D-link dph-400s; dph-400se voip telephone
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EXT KEY

EXT KEY
has the same usage with the Function key. "In" port connects the
phone, "Out" port connects the next one, if there is only, you don't need for
power supply; if there are more than one, you need supply 5V power for the first
one, and use RJ-11 direct connector to the others EXT.

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