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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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