Capacity:
D848: 4+16 extendable to 8+48
D168: 4+56 extendable to 16+128
D288: 16+56 extendable to 32+256

Features:
Account Code Entry
Automatically Call Back
Back-up Battery
Charge System & PC Port
CO to CO with Password
Class of Services
Call Hold Retrieve
Call Forward on Busy/No-answer
Call Splitting
Day/Night Services
DISA
Double-color Light
External Music
Extension Password
Intercom Caller ID & Transfer
One-touch Dialing
Ringing Pattern Selection
Paging
Setting Operator
Trunk number integrated
Voicemail System Compatible
Wake-up Call