README, UPGRADE.txt, system.conf.sample: Add documentation for using HWEC
Update documentation to the effect that HWEC is not enabled by default and must be enabled manually if desired via "echocanceller" in system.conf. git-svn-id: http://svn.astersk.org/svn/dahdi/tools/trunk@9528 17933a7a-c749-41c5-a318-cba88f637d49
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@@ -312,10 +312,11 @@ defaultzone=us
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# cancellers are compiled and installed as part of the dahdi-linux package.
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# You can specify in this file the echo canceller to be used for each
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# channel. The default behavior is for there to be NO echo canceller on any
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# channel, so it is very important that you specify one here if you do
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# not have hardware echo cancellers and need echo cancellation.
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# channel, so it is very important that you specify one here.
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#
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# Valid echo cancellers are: mg2, kb1, sec2, and sec.
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# Valid echo cancellers are: hwec, mg2, kb1, sec2, and sec.
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# 'hwec' is a special echo canceller that should be used if hardware echo
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# cancellation is desired on and available on the specified channels.
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# If compiled, 'hpec' is also a valid echo canceller.
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#
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# To configure the default echo cancellers, use the format:
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