During Calls
  | 
  | Dialing during a connected call | 
  | 
  | When calling interactive teleservices, e.g. telephone banks, you  | 
  | 
  | need to use Dual Tone Multi Frequency (DTMF) signals. If your | 
  | 
  | exchange has not been programmed to automatically convert your  | 
  | 
  | entered digits into DTMF signals, you need to activate the feature  | 
  | 
  | during the call.  | 
  | z  | During an ongoing call:  | 
Tones | Press (see display) and dial the requested digits. | |
  | Entered digits are transmitted as DTMF signals.  | |
  | 
  | Notes:  | 
  | 
  | You can also press 9and dial the required digits.  | 
  | 
  | Finland, press 1and dial the required digits.  | 
58  | Dialog 4223 Professional/Dialog 4225 Vision  |