fax fax fax fax help T.38 Ata HT-386

I have a trixbox 2.6.1 with a Inphonex trunk and now I need to setup a fax line.. Inphonex doesn't support T.38 then I was looking and the best option looks to be IPComms.net. We need to use the fax machine because the people doesn't like the fax to email (it's to slowly and there is no easy confirmation). For the machine we have a ATA HT-386, the thing is IPComms use different host incomming and outgoing then we need go to trixbox and setup trunk incomming and another trunk outgoing. Connecting the ATA directly to IPComms it works good but when we use the trixbox it looks like is not passign trough the T.38. I was trying all the forums and all the configurations. Do somebody knows how to check if the trixbox is passing trough the T.38 and maybe a working sample?

Thanks