[asterisk-users] Faxing issues

[Todd S]

What's the bets way to verify T.38 is being used on both incoming an
outgoing transaction?

On Fri, May 22, 2009 at 8:08 PM, Lee Howard <faxguy at howardsilvan.com> wrote:

> Todd S wrote:
> > Our call path is  Sip trunk from MAX TNT - Asterisk - T1 - Adtran
> > endpoint converting sip trunk to copper line for house wiring.
> >
> > Users at the endpoint can receive faxes without a problem.  However,
> > sending faxes are not so friendly.  1 out of 5 faxes will send
> > successfully.  The remaing 4 continually fail with the fax machines
> > reporting "Poor Line Quality".  QoS is setup on both ends and working
> > as expected across all traffic to and from both sides of the call.
> > Voice quality is good on calls from the same lines.  I've checked all
> > sides and had all vendors look at their equipment and they are all
> > pointing the finger at each other.  I've got sip traces from both ends
> > and both look good with the exception of random BYE's being sent from
> > the Adtran side of the call during random fax calls.  T.38 is enabled
> > on both ends as well.
> >
> > Anyone have any possible ideas where to look further or an idea of how
> > i could at least improve the situation?
>
> Is T.38 actually being used?  If not, then please see:
>
> http://hylafax.sourceforge.net/docs/fax-over-voip.pdf
>
> If T.38 is being used then it's probably due to a T.38 bug in one or
> more of the gateways, and you'll need to work with the provider of that
> T.38 gateway for a resolution.
>
> Thanks,
>
> Lee.
>
>
> _______________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>   http://lists.digium.com/mailman/listinfo/asterisk-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20090524/f6c86038/attachment.htm