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Gaspar Zoltan wrote:
<blockquote cite="mid:46a065cb.05ae660a.76cf.ffffaf46@mx.google.com"
type="cite">
<pre wrap="">Hi
I used NVFaxDetect with 1.2 for SIP. This application as far as I know
detects and decodes the fax sent in the voice channel a fax over voip
method. </pre>
</blockquote>
i'm using modified version for 1.4. it playes wav as backround and it
is possible to detect fax during play (using asterisk dsp library). It
cannot be detected when channel are bridged. <br>
<br>
I'm interested if it is technically possible to detect fax tone during
bridged channesl on SIP in easy way. Any suggestions?<br>
<br>
<blockquote cite="mid:46a065cb.05ae660a.76cf.ffffaf46@mx.google.com"
type="cite">
<pre wrap="">T.38 is a protocol that sends fax not encoded as sound, but directly
as digital data. For this is far more reliable.
Any network jitter will cause problems for nvfaxdetect and I was unable to
receive large faxes (more then 10 pages)with it. For small faxes it worked a
little bit better, but sometimes still failed.
Zoltan
-----Original Message-----
From: <a class="moz-txt-link-abbreviated" href="mailto:asterisk-dev-bounces@lists.digium.com">asterisk-dev-bounces@lists.digium.com</a>
[<a class="moz-txt-link-freetext" href="mailto:asterisk-dev-bounces@lists.digium.com">mailto:asterisk-dev-bounces@lists.digium.com</a>] On Behalf Of Alexey Borisov
Sent: Friday, July 20, 2007 9:07 AM
To: <a class="moz-txt-link-abbreviated" href="mailto:asterisk-dev@lists.digium.com">asterisk-dev@lists.digium.com</a>
Subject: Re: [asterisk-dev] autodetect fax on SIP channel
>Alexey Borisov wrote:
</pre>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">Hi All.
Tell me please, how-to detect fax call on SIP channel?
I found some information on voip-info about app_nv_faxdetect, but it
reffers me on newmantelecom site.
this site is not responsible anymore ;-(.
where i can take app_nv_faxdetect for asterisk 1.4? or possible any
instructions, how to make it work/
thanks
Alex.
</pre>
</blockquote>
</blockquote>
<pre wrap="">
Hi,
I think nv_faxdetect works to detect fax calls on ZAP (and mISDN), not SIP.
</pre>
</blockquote>
<pre wrap=""><!---->nv >listens
</pre>
<blockquote type="cite">
<pre wrap="">for the fax tones, and there are no fax tones on an incoming SIP.
Fax over SIP is done using T.38, and I don't know how to tell it is a fax
</pre>
</blockquote>
<pre wrap=""><!---->call >at the
</pre>
<blockquote type="cite">
<pre wrap="">start, i.e from the SIP INVITE.
Anyone?
</pre>
</blockquote>
<pre wrap=""><!---->
Really? But in man from voip-info.org ive seen, that NVFaxDetect function
implements fax detection just SIP and IAX channels.
here is article -> <a class="moz-txt-link-freetext" href="http://www.voip-info.org/wiki-NVFaxDetect">http://www.voip-info.org/wiki-NVFaxDetect</a>
I need it. Maybe anyone use it with aster 1.4.?
Alex.
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</pre>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Martin Vít
LAM plus s.r.o.
<a class="moz-txt-link-freetext" href="http://www.lam.cz/">http://www.lam.cz/</a>
Tel.: 605 267 610
</pre>
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