Configures the contrast of the LCD screen.
For SIP-T28P IP phones, it configures the LCD’s
contrast of the IP phone and the connected
EXP39.
For SIP-T26P IP phones, it configures the LCD’s
contrast of the connected EXP39 only.
For SIP-T19P and SIP-T21P IP phones, it
configures the LCD’s contrast of the IP phone
only.
Note: We recommend that you set the
contrast of the LCD screen to 6 as a more
comfortable level. It is only applicable to
SIP-T19P, SIP-T21P and SIP-T28P IP phones, and
EXP39 connected to SIP-T26P and SIP-T28P IP
phones.