4.17.3 Operation Guide........................................................................................................................ 125
4.18 COLOR RING......................................................................................................................................... 125
4.18.1 Introduction.................................................................................................................................125
4.18.2 Configuration..............................................................................................................................125
4.18.3 Operation Guide........................................................................................................................ 125
4.19 BLACKLIST & WHITELIST..................................................................................................................... 125
4.19.1 Introduction.................................................................................................................................125
4.19.2 Configuration..............................................................................................................................125
4.19.3 Operation Guide........................................................................................................................ 126
4.20 EMERGENCY PHONE NUMBER.............................................................................................................. 126
4.20.1 Introduction.................................................................................................................................126
4.20.2 Configuration..............................................................................................................................126
4.20.3 Operation Guide........................................................................................................................ 126
4.21 CALL TIME LIMIT..................................................................................................................................127
4.21.1 Introduction.................................................................................................................................127
4.21.2 Configuration..............................................................................................................................127
4.21.3 Operation Guide........................................................................................................................ 127
4.22 ALARM CLOCK..................................................................................................................................... 127
4.22.1 Introduction.................................................................................................................................127
4.22.2 Configuration..............................................................................................................................127
4.22.3 Operation Guide........................................................................................................................ 127
4.23 DONOT DISTURB..................................................................................................................................128
4.23.1 Introduction.................................................................................................................................128
4.23.2 Configuration..............................................................................................................................128
4.23.3 Operation Guide........................................................................................................................ 128
4.24 DELAY HOTLINE....................................................................................................................................128
4.24.1 Introduction.................................................................................................................................128
4.24.2 Configuration..............................................................................................................................128
4.24.3 Operation Guide........................................................................................................................ 129
4.25 INSTANT HOTLINE.................................................................................................................................129
4.25.1 Introduction.................................................................................................................................129
4.25.2 Configuration..............................................................................................................................129
4.25.3 Operation Guide........................................................................................................................ 129
4.26 CALL PARK........................................................................................................................................... 129
4.26.1 Introduction.................................................................................................................................129
4.26.2 Configuration..............................................................................................................................130
4.26.3 Operation Guide........................................................................................................................ 130
4.27 RECORDING...........................................................................................................................................130
4.27.1 Introduction.................................................................................................................................130
4.27.2 Configuration..............................................................................................................................130
4.27.3 Operation Guide........................................................................................................................ 130
4.28 CALL BACK ONBUSY...........................................................................................................................130
4.28.1 Introduction.................................................................................................................................130
4.28.2 Configuration..............................................................................................................................131
4.28.3 Operation Guide........................................................................................................................ 131
4.29 CENTREX...............................................................................................................................................131