III Function Key
CHK/CLR
To enter into system program mode/ delete the data or return to normal mode.
TH/TL KEY
For navigating caller ID numbers and checking 50 groups number in unit .
PAGE Key
For paging external loud speaker and key phones.
CONF Key
For m
aking a conference call.
↑↓Key
For adjusting the volume of speaker, handset, earphone and ring.
SPK. Key
For hand free talking.
MUTE Key
3
For muting (including handset talking, earphone talking and hand free talking ) during conversation