always disable ECM for fax calls over IP... its the 1st rule of thumb for VoIP faxing :=)<br><br><div class="gmail_quote">On Fri, Nov 11, 2011 at 2:48 PM, Alex Crow <span dir="ltr"><<a href="mailto:acrow@integrafin.co.uk">acrow@integrafin.co.uk</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">On 11/11/11 12:52, Alex Crow wrote:<br>
> If anyone's interested, I've get outbound fax semi-working with this setup:<br>
><br>
> <extension name="faxoutviamitel" continue="true"><br>
> <condition field="destination_number" expression="^9(\d{4})$"><br>
> <action application="set" data="absolute_codec_string=PCMA"/><br>
> <action application="set" data="fax_enable_t38=true"/><br>
> <action application="set" data="sip_execute_on_image=t38_gateway self<br>
> nocng"/><br>
> <action application="bridge" data="sofia/external/$<a href="mailto:1@10.10.0.2">1@10.10.0.2</a>"/><br>
> </condition><br>
> </extension><br>
><br>
> t38modem is started like this:<br>
><br>
> t38modem -ttt -o /var/log/t38modem.log --no-h323 -u t38modem<br>
> --sip-register <a href="mailto:t38modem@192.168.20.245">t38modem@192.168.20.245</a>,secret --sip-listen udp\$*:6060<br>
> --ptty +/dev/ttyT38-1 --route<br>
> "modem:.*=sip:<dn>@<a href="http://192.168.20.245" target="_blank">192.168.20.245</a>;OPAL-Force-Fax-Mode=true" --route<br>
> "sip:.*=modem:<dn>"<br>
><br>
><br>
> The remaining problem is that on the receiving end we only have the top<br>
> centimetre or two of the image. I think this may be a tiff library issue<br>
> but I'm not sure.<br>
><br>
> Cheers<br>
><br>
> Alex<br>
><br>
<br>
In the end I had to disable ECM in the Hylafax modem definition for<br>
t38modem, this was what was causing the image truncation. Odd, because<br>
both t38modem and spandsp ostensibly support ECM. I'm wondering if I was<br>
sending audio out directly over TDM rather than via a SIP gateway using<br>
G.711 then ECM would be OK... probably a timing issue.<br>
<br>
Cheers<br>
Alex<br>
<br>
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