DTMF In band and Out of band - what is the meaning

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nekote:
I may have a DTMF issue.

I would like to better understand what In-Band and Out of Band means.

In-band meaning transmitted over the regular audio channel that the far end hears us on?

Out of Band some Telco special auxiliary / side bandwidth?

QBZappy:
DTMF: In-band & Out-of-Band
http://forums.whirlpool.net.au/archive/725830

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