[Asterisk-Users] T.38 Faxing -> at astricon ?

[Roy Sigurd Karlsbakk]

>> What do you mean more supporters. t.38 is only *reliable* way for  
>> transporting
>> fax over ip. Fax over g711 is pure luck...
>>
>
>
> Hi,
>
> it is rather a question of IP quality than good luck.
>
> I think, 99.9% of all faxes are transported via G.711.
> Is there any telecom network operator left using ananlog
> lines? Analog is either the 5 meter way from the fax machine to
> the BRI/PRI adapter at the wall or maybe even the 1000 meter way from
> the home/office to the next switch of the network operator.
>
> Thus the main difference is the high quality of the managed
> ISDN network compared to the unmanaged IP network.
>
> That's why, imho, analog faxing via VoIP is not pure luck,
> since one _does_ know the relevant parameter.
>
> If I have some means for a very good internet connectivity,
> faxing will work without problems, if not, you are right,
> it will become pure luck or just impossible (without T.38).

see http://soft-switch.org/foip.html for a brief explaination of why  
this generally doesn't work...