Hi, I have setup 3CX V4 using a Patton 4554 ISDN PSTN Gateway. I can receive incoming faxes succesfully, but I cannot start a T.38 fax call from a 3CX extension. Gateway config has been slightly "hand" modified. When I try this: FAX MACHINE > SPA 2100 Analog Adapter > 3CX > PATTON 4554 > PSTN The fax calls are succesful if I use G711 "passtrough". But when I allow SPA2100 to use T.38, calls are droped as soon as the SPA 2100 detects it is a fax. Maybe T.38 is still not supported to place calls from an extension? Is there a way to send faxes using the integrated 3CX V4, or fax support is "receive only" right now?