[asterisk-users] fax / t38 gateway

Fri Oct 24 08:35:53 CDT 2008

I'll look into those devices mentioned.

I think that I have one last question... I don't intend to have a  
hardware fax machine on our end, I really just want it to get to  
asterisk then email it from there. I know this can be done with  
hylafax/iaxmodem etc, I actually have gotten that to work  
intermittently, but supposing I did find an ITSP with t.38 support,  
what would the steps be on the asterisk to receive that fax? I presume  
it would just be something like:

exten => _XX.,n,Answer()
exten => _XX.,n,Wait(3)
exten => _XX.,n,Set(TIFFFILE=/var/spool/faxes/incoming-fax.tif)
exten => _XX.,n,ReceiveFAX(${TIFFFILE})
exten => _XX.,n,Set(EMAIL=brendan.martens at crosscomm.net)
exten => _XX.,n,System('mewencode -e ${TIFFILE} | mail -s fax ${EMAIL}')
exten => _XX.,n,System('rm ${TIFFILE}')

That is what I was trying before I realized that it wouldn't work due  
to ReceiveFAX() expecting t.38, right? But if it were coming in as t. 
38 that is all there would be to it?

Thanks once again for taking the time to answer my questions.

Brendan Martens

On Oct 24, 2008, at 3:22 AM, Olivier wrote:

>
>
> 2008/10/23 Brendan Martens <brendan.martens at crosscomm.net>
> Indeed I am going for pure voip and trying to figure out how to
> implement t.38, as you suggest.
>
> On Oct 23, 2008, at 2:08 AM, Olivier wrote:
>
> > I think Brendan is asking about endpoints (how to connect fax
> > machines to pure VoIP).
> >
> > Short answer:
> > - you could connect standalone T.38-enabled analog gateways to 1.4,
>
> Like what? I'm not familiar with this tech, I googled around a bit but
> didn't come up with much. I think I just don't know the lingo yet. :
> ( Could you point out one of these?
>
> Linksys PAP2  or 3102 for instance
> or Patton M-ATA
>
> In fact, I would say most analog gateways with FXS port should also  
> support T.38.
> In this case, your setup would be :
>
> ISTP ----<xDSL> --- router ---<LAN> ---Asterisk 1.4 ---<LAN> --- 
> analog gateway === fax machine
>
> As you mentioned, your IP Telephony Service Provider, would have to  
> provide T.30/T.38 conversion so that whenever you're sending or  
> receiving a fax, it would flow in ou or of your network.
>
>
> >
> > - with 1.6, you can also use an analog board inside a server and
> > connect fax machines to this board.
>
> So basically what you're saying is that to do this (convert the analog
> to t.38) myself I would still need to have analog coming into my
> asterisk server (which makes sense, but doesn't help me avoid paying
> for "normal" phone lines)... Sounds to me like in this situation t.38
> would be purely for getting faxes around on my own asterisk(s) if that
> became necessary.
>
> What I meant is that, instead of using a separate box for connecting  
> your own fax machine, you could use an analog board such as :
>
> ITSP ----<xDSL> --- router ---<LAN> ---Asterisk 1.6 w/ FXS board   
> === fax machine
>
> Just as previous 1.4 setup, you wouldn't need a separate analog line  
> for faxing.
> But judging from your question, I would add that it's not common to  
> find an ITSP able to deliver T.38 services (inbound or outbound).
> And if you want to be able to switch from one provider to another,  
> or simply for simplicity, it's recommended practice to dedicate an  
> analog line to faxing.
>
> You setup becomes :
>
> ITSP ----<xDSL> --- router ---<LAN> ---Asterisk 1.6 w/ FXO-FXS  
> board  === fax machine
>                                                                        | 
> |
> PSTN ===============================
>
> I should also add that if you're having a single fax machine, maybe  
> you should just connect it to an analog line.
>
>
>
>
>
> Which leads me to my other question again, is there some sort of
> internet service that will do the analog to t.38 conversion for me and
> then pass the t.38 on to my asterisk server?
>
> In your previous question you said "pure VoIP" which implied you had  
> found such provider.
> Here you will some answers :
> http://www.voip-info.org/wiki/view/VOIP+Service+Providers+T.38
>
>
>
>
> >
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>
> Andrew you mentioned something about sip providers that support t.38?
> When you say support, do you mean that they have passthrough turned
> on, or they will actually do an analog t.30 to t.38 conversion for
> you? That may be what I'm after... If you, or anyone else, know of a
> provider that does this could you point me in the right direction?
>
> Thank you all for your thoughts.
>
> Brendan Martens
>
>
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