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benoit at plessis.info
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 Posted: Tue Jun 17, 2008 9:54 am Post subject: [asterisk-users] Zapata/DAHDI Disable Hardware echo canceler |
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Is it possible on a TE220p to deactivate the hardware echo canceler at
will ? (With a function in the dialpan for example)
example for fax SDA ,beeing able to shutdown the echo canceler could
give better results don't you think ? |
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kpfleming at digium.com
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| Posted: Tue Jun 17, 2008 10:56 am Post subject: [asterisk-users] Zapata/DAHDI Disable Hardware echo canceler |
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Benoit Plessis wrote:
| Quote: | Is it possible on a TE220p to deactivate the hardware echo canceler at
will ? (With a function in the dialpan for example)
example for fax SDA ,beeing able to shutdown the echo canceler could
give better results don't you think ?
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All echo cancelers using Zaptel/DAHDI already disable themselves when
FAX or modem communications are used, based on reception and detection
of the CED tone that FAX machines and modems generate to make that
happen. You can tell this happened by looking at the channel in Asterisk
using 'zap show channel' or 'dahdi show channel' as it will show you
that the echo canceler was disabled automatically.
--
Kevin P. Fleming
Director of Software Technologies
Digium, Inc. - "The Genuine Asterisk Experience" (TM) |
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steinwendtner at gmx.net
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| Posted: Tue Jun 17, 2008 11:41 am Post subject: [asterisk-users] Zapata/DAHDI Disable Hardware echo canceler |
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Kevin P. Fleming wrote:
| Quote: | Benoit Plessis wrote:
| Quote: | Is it possible on a TE220p to deactivate the hardware echo canceler at
will ? (With a function in the dialpan for example)
example for fax SDA ,beeing able to shutdown the echo canceler could
give better results don't you think ?
|
All echo cancelers using Zaptel/DAHDI already disable themselves when
FAX or modem communications are used, based on reception and detection
of the CED tone that FAX machines and modems generate to make that
happen. You can tell this happened by looking at the channel in Asterisk
using 'zap show channel' or 'dahdi show channel' as it will show you
that the echo canceler was disabled automatically.
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I thought the ec gets disabled only by the ec disable tone and not the CED tone.
regards
Hans |
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kpfleming at digium.com
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| Posted: Tue Jun 17, 2008 2:08 pm Post subject: [asterisk-users] Zapata/DAHDI Disable Hardware echo canceler |
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Johann Steinwendtner wrote:
| Quote: | I thought the ec gets disabled only by the ec disable tone and not the CED tone.
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The CED tone *is* the echo canceler disable tone.
--
Kevin P. Fleming
Director of Software Technologies
Digium, Inc. - "The Genuine Asterisk Experience" (TM) |
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