Send dtmf tones, 0dnlqj d skrqh fdoo, Doo phqx 2swlrqv – Siemens SL 42 User Manual
Page 19: 6hqg '70) wrqhv

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Switch the microphone
on or off. If switched
off, the person on the
other end of the line
can hear nothing.
Alternatively:
Hold
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While the connection
continues, the call
duration and (if set, see
p. 54) the call time/cost
are displayed.
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0DLQ PHQX
Direct access to the
main menu.
&DOO VWDWXV
List all held and active
calls (e.g. participants
in a conference call).
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Transmit the control
codes created by the
keys or Addressbook.
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Digits entered during a call are
transmitted directly as DTMF
signals so that an answering
machine, for example, can be
controlled (DTMF = Dual Tone Multi
Frequency).