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Improved interpretation of DTMF tones in DtmfTransformEngine #433

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@cbeckr cbeckr commented Aug 4, 2018

This change addresses a number of issues that led to incorrect interpretations
of DTMF tones, especially tone sequences.

It introduces a queue to mitigate previous thread-safety issues and handle
more than one RTP packet at a time (a single tone is associated with at least
three RTP packets).

It also adds support for recognizing shorter tones (<120 ms) that are typically
represented by one self-contained RTP packet containing both start and end
indications.

Note: Corporate CLA was completed on 2018-08-03.

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Hi, thanks for your contribution!
If you haven't already done so, could you please make sure you sign our CLA (https://jitsi.org/icla for individuals and https://jitsi.org/ccla for corporations)? We would unfortunately be unable to merge your patch unless we have that piece :(.


notifyAll();
}
queue.offer(p);
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I haven't read the diff carefully, but: PacketTransformers should not keep the RawPacket/DtmfRawPacket instances, because these instances and their buffers are re-used. I don't expect many DTMF packets, so a simple clone() should be enough.

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Thanks for your feedback. In e982394, I added a clone() implementation for DtmfRawPacket and added the call on line 626.

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cbeckr commented Mar 3, 2021

Is there still interest in this PR? If so, I'd be happy to update it. I see some files were moved but the underlying code hasn't changed much.

This change addresses a number of issues that led to incorrect interpretations
of DTMF tones, especially tone sequences.

It introduces a queue to mitigate previous thread-safety issues and handle
more than one RTP packet at a time (a single tone is associated with at least
three RTP packets).

It also adds support to recognize shorter tones (<120 ms) that are typically
represented by one self-contained RTP packet containing both start and end
indications.
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cbeckr commented Mar 26, 2021

Rebased - this is ready for review once more.
8x8 CLA completed 2021-03-26

Tested with The Test Call:

  • Invite sip:thetestcall@sip2sip.info
  • Dial #, then 2
  • Dial a DTMF sequence followed by #
  • It should read back the exact sequence

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3 participants