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res_tonedetect: Add call progress tone detection

Makes basic call progress tone detection available in a tech-agnostic manner with the addition of the ToneScan application. This can determine if the channel has encountered a busy signal, SIT tones, dial tone, modem, fax machine, etc. A few basic async progress tone detect options are also added to the TONE_DETECT function. ASTERISK-29720 #close Change-Id: Ia02437e0450473031e294798b8cb421fb8f24e90

1 parent f6aed7b commit 4468fc1Copy full SHA for 4468fc1

2 files changed

doc/CHANGES-staging
- tonescan.txt
res
- res_tonedetect.c

`‎doc/CHANGES-staging/tonescan.txt‎`

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 +Subject: ToneScan application
++
 +A new application, ToneScan, allows for
 +synchronous detection of call progress
 +signals such as dial tone, busy tone,
 +Special Information Tones, and modems.

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