★ Unconditional transfer
★ Three party call
★ Transfer in case of busy
★ Request for transfer
★ Privileged dialing
★ Multiple transfers
★ Seven level locking control
★ No response and ring back
★ Call out time limit
★ Computer operator
★ Elastic coding
★ Open the external line at will
★ Outside line reservation
★ Manual/computer duty
★ Ring self inspection
★ Flash off time is adjustable
★ Self reporting extension number
★ Multiple outgoing lines
★ Secondary call display
★ PC display/internal display
★ Substitute receiving and dialing
★ Three segment digital recording
★ Group call/teleconference
★ Secret recording of any extension (with a secret recorder)