OFF [0]: No DTMF Side Tones
are heard
DT-ST [1]: Side Tones are heard
only from manually keyed DTMF
codes
ANI-ST [2]: Side Tones are heard
only from automatically keyed DTMF
codes
DT+ANI [3]: All DTMF Side Tones are
heard
BOTH [3]: The selected S-CODE is
sent at the beginning and ending
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