What's the bets way to verify T.38 is being used on both incoming an outgoing transaction?<br><br><div class="gmail_quote">On Fri, May 22, 2009 at 8:08 PM, Lee Howard <span dir="ltr"><<a href="mailto:faxguy@howardsilvan.com">faxguy@howardsilvan.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="im">Todd S wrote:<br>
> Our call path is Sip trunk from MAX TNT - Asterisk - T1 - Adtran<br>
> endpoint converting sip trunk to copper line for house wiring.<br>
><br>
> Users at the endpoint can receive faxes without a problem. However,<br>
> sending faxes are not so friendly. 1 out of 5 faxes will send<br>
> successfully. The remaing 4 continually fail with the fax machines<br>
> reporting "Poor Line Quality". QoS is setup on both ends and working<br>
> as expected across all traffic to and from both sides of the call.<br>
> Voice quality is good on calls from the same lines. I've checked all<br>
> sides and had all vendors look at their equipment and they are all<br>
> pointing the finger at each other. I've got sip traces from both ends<br>
> and both look good with the exception of random BYE's being sent from<br>
> the Adtran side of the call during random fax calls. T.38 is enabled<br>
> on both ends as well.<br>
><br>
> Anyone have any possible ideas where to look further or an idea of how<br>
> i could at least improve the situation?<br>
<br>
</div>Is T.38 actually being used? If not, then please see:<br>
<br>
<a href="http://hylafax.sourceforge.net/docs/fax-over-voip.pdf" target="_blank">http://hylafax.sourceforge.net/docs/fax-over-voip.pdf</a><br>
<br>
If T.38 is being used then it's probably due to a T.38 bug in one or<br>
more of the gateways, and you'll need to work with the provider of that<br>
T.38 gateway for a resolution.<br>
<br>
Thanks,<br>
<br>
Lee.<br>
<br>
<br>
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