[asterisk-biz] T.38 Fax2Mail

[Leo Ann Boon]

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