[asterisk-users] Faxes

[dave george]

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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