[asterisk-dev] [Code Review] dsp.c User configuration of DTMF_NORMAL_TWIST and DTMF_REVERSE_TWIST values

[Alec Davis]

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https://reviewboard.asterisk.org/r/2141/
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Review request for Asterisk Developers and Matt Jordan.


Summary
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Various countries have different specifications for the maximum power level differences between the DTMF low group and high group of frequencies.

Power level difference between frequencies for different Administrations/RPOAs
 NTT        = Max. 5 dB
 AT&T       = 4dB(reverse) to 8dB(normal)
 Danish     = Max. 6 dB
 Australian = Max. 10 dB
 Brazilian  = Max. 9 dB
 ETSI       = Max. 6dB from ETSI ES 201 235-3 V1.3.1 (2006-03)

Now allow 4 variables to be individually configured, in dsp.conf, with reasonable min/max of 2dB to 20dB.


This addresses bug ASTERISK-20442.
    https://issues.asterisk.org/jira/browse/ASTERISK-20442


Diffs
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  trunk/CHANGES 374206 
  trunk/configs/dsp.conf.sample 374206 
  trunk/main/dsp.c 374206 

Diff: https://reviewboard.asterisk.org/r/2141/diff


Testing
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compiled with/without RADIO_RELAX
reloaded dsp with bogus values, and defaults are confirmed as loaded.

made some calls with FXS connected phone.
Simple check for talkoff, none heard. 


Thanks,

Alec

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