[asterisk-users] spandsp (foip)

[Steve Underwood]

Christopher Corn wrote:

> I've been reading about FOIP and there something i dont undrestand. 
> maybe someone can explain to me.
>  
> A couple of faxing methods im confused about.
>  
> The pass through method, sending fax data over G711 codec
> versus
> Relay method, t30 to t38 conversion
>  
> Can someone explain to me why the pass through method doesn't require 
> t30 to t38 conversion ( or does it do it?)? i believe the conversion 
> to t38 is so that it can be routed through a packet network and then 
> back to t30 so that the fax machine can understand. why is it that if 
> you use a pass through method, and your still passing through a packet 
> network, you dont need to convert to t38 and t30?
>  
> hope this makes sense. thanks alot.

See http://www.soft-switch.org/foip.html

Steve