T38 fax software

Does anyone have a working implementation of T38 software working on asterisk 1.4 or 1.6 that allows T38 faxes through asterisk from one external endpoint to another external endpoint? Passthrough is not an option, so I need something that handles the T38 reliably.

Any guidance towards software capable would be greatly appreciated.

If you need to do realtime conversion, ie a T30 - T38 gateway, you may look at

I havent used it personnally, just knows it exists. Other feedback welcome !