AASTRA 4223 Professional for BusinessPhone User Guide - Manual (Page 96)

Other Useful Features
BusinessPhone — Dialog 4223 Professional / Dialog 3213 96
DTMF Tones
The DTMF function is used to control answering machines or any
other telecommunication devices.
z
Make an internal or external call to reach the desired device.
When your call is answered you can continue to dial digits which
will be sent as DTMF digits (tone signals) to the called device in
order to activate the desired functions.
Immediate Answer
It is possible to get automatic hands-free answering on internal
calls without pressing the Line key. If you require this facility, please
ask your system administrator.
Immediate Answer
Ô
Press the Immediate Answer key (pre-programmed).
Incoming calls will be indicated by one muted ringing signal, the
On/Off lamp lights and the call comes straight in through the
loudspeaker.
Note: To accept a transferred external call you must first
press the Transfer key.
Cancel Immediate Answer
Immediate Answer
Х Ф
Press the Immediate Answer key (pre-programmed).
The lamp extinguishes.