Snom 190 - Manual (Page 50)

50 • Advanced Functions
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On no response (CCNR)
While calling a number you can enable call completion on no
response by pressing the CC key.
The phone will now wait for the dial destination to become active
again. The user can make and receive calls in the meantime by pressing
“Cancel” and going to the idle screen.
When the other side is available, the display will prompt you to
dial the number again.
By pressing key, the phone will redial the number in order to
establish a connection to the other party that was previously busy and is
now idle again. That was previously idle and is now active again.
DTMF Tones
During a call, e.g. with a voicemail system, pressing the digits 0-
9, * or # will generate and send DTMF tones to the other party.