[Freeswitch-users] T.30 <---> T.38 howto ?!

Hi people! I am using hylafax with mod_spands and I have problems to setup the dialplan. Here is the case: Hylafax (T.30) <--> FS (T.38) <--> VoIP Provider (T.38) How is the diaplan successfully to setup to successfully make a T.30 <--> T.38 sending and receiving?! I am not getting smart, for any help I would kindly thank you all. Tamer