Hi all We are trying to use SpanDSP modems with FS and hylafax for outbound faxing. We dial through FS0 modem to PSTN gateway. When FS receives a reinvite to T.38 from GW, it never replies with 200 OK, instead it begins to send t.38 data, which is ignored by gateway as it still waits for response on T.38 reinvite. After 30 seconds timeout GW sends BYE. Should I open ticket or we just need correct t38_gateway application params? What is recommended setup if there is a hylafax behind Freeswitch, and PSTN gateway is T.38-capable and sends T.38 re-invite by itself? I tried different combinations from wiki, results are different in details but one thing persists - there is no 200 OK from FS to T.38 re-invite on outbound call through FS0 modem. -- Best regards, Dmitry Sytchev, IT Engineer