[asterisk-users] Faxes

[Joel Maslak]

g711 across a network without perfect jitter/delay characteristics will not
work.

You cannot do g711 faxing across the internet - at all.

It's not a perfect solution even in an office on a dedicated LAN environment
(you'll still get failed faxes).

On Fri, Sep 3, 2010 at 12:32 PM, dave george <dgeorge at teletoneinc.com>wrote:

> Thanks Kevin,
>
> I tried passing it over VOIP using g711U codecs with no success.  I will
> try
> using the patches that you mentioned and post the results.
>
> Thanks,
> Dave
>
>
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Kevin P.
> Fleming
> Sent: Friday, September 03, 2010 2:17 PM
> To: asterisk-users at lists.digium.com
> Subject: Re: [asterisk-users] Faxes
>
> On 09/03/2010 10:50 AM, dave george wrote:
> > The asterisk box is connected to the PSTN using TE410 cards.  Asterisk
> talk
> > SS7 to the PSTN.  On the IP side I use SIP.  I terminate calls onto the
> > PSTN.
> >
> > The carrier sending the calls wants me to be able to pass faxes to
> physical
> > fax machines on the PSTN.  So far they are failing.
> >
> > We just want ot be able to pass faxes using g711u or t.38 pass through.
>
> As I told you on the asterisk-ss7 list, you can't 'pass through' T.38,
> because the PSTN does not speak T.38. If one side of the call is SIP,
> and the other side is TDM, then you have only two choices: pass the call
> through in audio mode (FAX over VoIP), or act as a T.38 gateway (FAX
> over T.38).
>
> At this time, the only option without patching Asterisk is to pass the
> call through in audio mode, but there are many, many problems with doing
> FAX over VoIP (Steve Underwood's page on the soft-switch.org site
> explains them very well).
>
> There are patches in the issue tracker at issues.asterisk.org to add
> T.38 gateway functionality to various releases of Asterisk, and they
> work well for quite a few people. If you added that, you'd be able to
> act as a T.38 gateway, which would dramatically increase your chances of
> success.
>
> --
> Kevin P. Fleming
> Digium, Inc. | Director of Software Technologies
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> skype: kpfleming | jabber: kfleming at digium.com
> Check us out at www.digium.com & www.asterisk.org
>
> --
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