[asterisk-biz] T.38 Fax2Mail

[David]

Hello,

I never heard of G.729 pass-thru. I'm not sure that it exists.

In any case, the way T.38 works (at least in my network) is that when the receiving end detects that a fax machine answered the call, it sends a reINVITE with a request to switch to T.38, regardless of the codec used for the call setup.

Since all my DID providers and own gateways are configured and tested successfully with T.38, I don't want to start playing around with other things (like G.711).

I need (if it's possible) Asterisk to be configured to send T.38 reINVITE immediately when it connects the call, if it knows that it's for a "Fax DID" and connect in T.38 and once received, send the fax to the email address of the customer in PDF or Tiff format.

If anyone did this and knows how (and wants) to do it, I'd appreciate your quote.

Thanks.

----- Original Message ----
From: Leo Ann Boon <leo at datvoiz.com>
To: Commercial and Business-Oriented Asterisk Discussion <asterisk-biz at lists.digium.com>
Sent: Monday, October 30, 2006 7:30:22 AM
Subject: Re: [asterisk-biz] T.38 Fax2Mail

Mitul Limbani wrote:
> Hello David,
>
> Quoting David <dst_u at yahoo.com>:
>
>> Hello,
>>
>> We would like to offer Fax2Mail service through Asterisk, using T.38 
>> (we do not support G.711 pass-thru) protocol.
>
> Did you mean G729 pass-thru ? I havent heard of term G-711 Pass-thru :)
Now you do :). Yes, some ATA do that. The moment a fax tone is detected, 
it drops to G.711 regardless of the codec setting.

>
> So you wish to run Fax2Mail using G729 Compression codec ?
>
> We had success of recieving Fax by using G711 codec on a T38 supported 
> ATA.
So, you're using T.38 or just fax over G.711? The ATA may support T.38 
but doesn't necessarily imply your fax was relayed via T.38.

Even T.38 is no panache for every problem. Have you ever tried to relay 
T.38 to a C**** gateway more than 4 hops away? Read Steve Underwood's 
website if you want to understand the issues.

Back to david's question:
Personally, I won't bet the farm on using Asterisk to run a T.38 fax to 
mail service. In fact, I'd be very careful about using T.38 in general. 
There're just too many broken T.38 equipment out there. I believe you 
can get good results (>80%) if you restrict yourself to a select list of 
endpoints. Otherwise... Let's just say I won't want to be working in 
your help desk department.

Leo

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