AASTRA DT390 for BusinessPhone User Guide EN - Manual (Page 56)

1424-EN/LZT 103 091 Uen D 2010-02-12 56
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9.11 Dialing During a Connected Call
When calling interactive teleservices, such as phone banks, you need to
use Dual Tone Multi Frequency (DTMF) signals. If the phone exchange
is not already programmed to automatically convert entered digits into
DTMF signals, this function needs to be activated during the call.
To dial digits during a connected call, do the following:
1. Press More, select DTMF and press Select.
2. Dial the required digits.
The entered digits are transferred as DTMF signals.