[EMAIL PROTECTED] wrote:
I have seen the following effect in Asterisk, though: where it converts an inband DTMF (eg coming off a Zap channel) into an indication, it mutes the audio where that tone is. But sometimes it leaves a teeny bit of the tone behind.
Yes, that is correct. By the time that DTMF detector has determined that the tone exists, some of the tone has already been passed on. This occurs because the Asterisk DSP runs in parallel with the audio path, not in the middle of it, so it cannot 'delay' the audio to be able to mute it retroactively.
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