[Asterisk-Users] T.38 fax with SIP devices

[Scott Wolfe]

I have been on the same path although I am using a TDM400. No matter what I
did I could not get a fax to go through. Yesterday I moved the * server
outside my firewall and the rest of the network and now I am making more
progress. I blame it on old network hardware. I have two accounts, one with
Broadvoice and the other with LiveVoip. The Broadvoice fax is going through
with out any problems. LiveVoip faxing still fails. I would like to use
LiveVoip so I will keep at it.
-Scott



----- Original Message ----- 
From: "Moody" <asterisk.user at gmail.com>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<asterisk-users at lists.digium.com>
Sent: Thursday, April 07, 2005 7:52 AM
Subject: Re: [Asterisk-Users] T.38 fax with SIP devices


> Hello Mark,
>
> I have been working on a similar plan but am still looking for
> reasonable/tested hardware - can you tell me what devices you are
> using?
>
> Thanks,
>
> Jonathon
>
>
> On Apr 7, 2005 7:01 AM, Mark Dutton <replies at datamerge.com.au> wrote:
> >
> > Hi there
> >
> > I have a SIP ATA with a fax machine attached and a SIP FXO gateway to
the
> > PSTN. When I try to send faxes in either direction, I get nothing but
stony
> > silence. I have changed the gateway and the ATA to peer to peer mode to
test
> > them and they happily do the T.38 thing and faxes flow.
> >
> > It seems that they initially negotiate a G.729 codec, which is what I
want
> > and then when the receiving end detects the fax machine, it wants to
> > re-negotiate and use the t38fax codec. This is the working the Micronet
> > devices use at least.
> >
> > When I put the units into proxy mode and run them through Asterisk, they
> > fail at the negotiation stage.
> >
> > Now I have learned from my dealings with Asterisk and the newsgroup that
> > Asterisk does not do T.38. However, why should it not let devices do
T.38?
> > My debug messages from Asterisk don't show it saying no, but the
gateways
> > don't wont' setup the T.38 on Asterisk.
> >
> > I have chanded sip.conf to allow=all and there are no explicit rules in
the
> > registrations for the gateways.
> >
> > Does anyone have an idea here?
> >
> > For this venture to be truly usable, I have to be able to get FAX
working at
> > this basic level.
> >
> > Regards
> >
> > Mark Dutton
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