[asterisk-users] Still on spandsp/app_fax and T.38

[Vinícius Fontes]

Yes, the fax machine only transmits at 9600. That's normal and expected. I'll capture the packets and will provide you with a link to download it in a few minutes.



Atenciosamente,

Vinícius Fontes
Gerente de Segurança da Informação
Canall Tecnologia em Comunicações
Passo Fundo - RS - Brasil
+55 54 2104-7000

Information Security Manager
Canall Tecnologia em Comunicações
Passo Fundo - RS - Brazil
+55 54 2104-7000

----- "Steve Underwood" <steveu at coppice.org> escreveu:

> On 02/05/2010 07:40 PM, Vinícius Fontes wrote:
> > This message is pointed directly to Steve Underwood. I tought it
> would not be nice to directly email him with a question that interests
> a good part of the Asterisk community, so here it is. :)
> >
> > Steve, remember a few days ago when we discussed about issues on
> Asterisk 1.6.1.13 and T.38 fax reception? Well I opened an issue on
> Mantis (https://issues.asterisk.org/view.php?id=16756) and turns out
> it might be spandsp-related.
> >
> > What happens is, when I use app_fax to receive a fax using T.38, I
> get very low transmission rates, and about 30% of the faxes are just
> not transmitted at all. 2400bps is not uncommon. If instead of T.38 I
> use an analog landline connected to that very same Asterisk box,
> app_fax works wonderfully well transmitting at full 9600bps. Just to
> rule out Asterisk's T.38 handling, I noticed that Fax For Asterisk
> works perfectly with T.38, also on that same box.
> >    
> Is the FAX machine you are using only capable of 9600bps, because full
> 
> speed should be 14400bps?
> 
> Can you get a packet trace of a problem call, using wireshark, and
> mail 
> it to me?
> > I'll be happy to provide you any info that could help solve this
> issue.
> >
> >    
> Steve
> 
> 
> -- 
> _____________________________________________________________________
> -- 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