[asterisk-bugs] [DAHDI-linux 0013562]: [patch] It's necessary to have low frequency filter for tx signal of DAHDI.
Asterisk Bug Tracker
noreply at bugs.digium.com
Tue Jun 2 05:22:13 CDT 2009
A NOTE has been added to this issue.
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https://issues.asterisk.org/view.php?id=13562
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Reported By: biohumanoid
Assigned To: sruffell
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Project: DAHDI-linux
Issue ID: 13562
Category: dahdi (the module)
Reproducibility: have not tried
Severity: feature
Priority: normal
Status: confirmed
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Date Submitted: 2008-09-26 04:27 CDT
Last Modified: 2009-06-02 05:22 CDT
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Summary: [patch] It's necessary to have low frequency filter
for tx signal of DAHDI.
Description:
It's necessary to have low frequency filter for tx signal of DAHDI.
Otherwise, low-frequency signal from IP can reach a leased line, and
return back with nonlinear distortions. This will break an echo canceller.
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(0105877) biohumanoid (reporter) - 2009-06-02 05:22
https://issues.asterisk.org/view.php?id=13562#c105877
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dahdi-base.c.https://issues.asterisk.org/view.php?id=2.patch
Changed the condition
(ECHO_MODE_IDLE != chan->ec_state->status.mode)
to
(ECHO_MODE_ACTIVE == chan->ec_state->status.mode)
I think we have no reason to call HPF in FAX mode.
echocanceller can read status.mode and ignore the request, but what for ?
Issue History
Date Modified Username Field Change
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2009-06-02 05:22 biohumanoid Note Added: 0105877
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