T.38 protocol has been officially supported since 2011-11-15.
It is therefore possible to increase fax reliability by using a T.38 compatible analog adaptor to connect a physical or virtual fax machine.
Here is a list of hardware and software that has been officially tested so far:
- SPA112 / SPA122
- HT286 / HT287
- Asterisk v1.8.x
- Asterisk v10.x
- Brooktrout® Fax Service Provider Software
There are many other compatible devices out there that we have not officially tested.
This does not mean that the program or item used is not compatible.