[Freeswitch-users] Flash Hook to an FXO port (ata)

Gents, Does any one have a good setup to send a flash hook to an analogue line? Preferably with an ATA of some sort. So far I've been trying with an Linksys SPA3102, which can do a flash hook with the specific mime type : application/hook-flash , with Freeswitch I the send_dtmf didn't get me any further than sending the special flash key F in application/dtmf-relay. Which is not interpreted by the SPA3102 as a flash hook. Hence, does anyone have a good strategy from a Freeswitch pov to send a flash hook signal (do I need to think sipsak?), or an ATA/firmware which does support the F key in dtmf? Season grtz! Davy