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modem spec for generating DTMF tones during a voice call

Posted on 2010-09-21
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Last Modified: 2013-12-27
Which modem protocol includes the ability for a modem to generate DTMF tones during a voice call? Is that part of one of these?:

Modem Protocols: ITU-T V.92/K56Flex, ITU-T V.34bis, V.34, V.32bis, V.32, V.22bis, V.22, V.21, V.23 Bell 212A/103, V.80

I need to make sure that the modem I specify for an application has the ability to generate (as directed by the appropriate AT commands) DTMF tones during a voice call.
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Question by:lee88
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giltjr earned 500 total points
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No modem protocol defines that.  The protocols listed deal with how the two modems exchange data.

I'm not even sure modems can generate DTMF tones during a call.  About the only way I could think they could is to escape out of data modem and the issue ATDT#### commands where #### are the numbers you want to "dial" and then go back into data mode.  Typically the escape sequence is 3 pluses (+++) preceded by and followed by at least 1 second of no other data being transferred.  It it would be

No data transfer for at least one second
+++
No data transfer for at least one second
ATDT#
ATO

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