PLANET VIP-2020PT - Manual (Page 88)

Enterprise HD PoE IP Phone
VIP-2020PT
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, User don’t need for power supply, if there are more than
one, User need supply 5V power for the first one, and use RJ-45 direct connector.
8.3.5.3 SOFTKEY
SOFTKEY
User can configure different functions in different screens for every softkey.