[asterisk-users] Requirements for faxes to work properly

[dima]

Hello, everyone.
I'm reading about the asterisk new features. One is T.38 protocol
support. I used faxes before with asterisk 1.2 and everything was
working quite well. Could anyone explain what have changed in the way
faxes are handled.
Another thing is, in order for asterisk to work over T.38 with my fax
machine do I also need a T.38 support from my ATA and my SIP provider?
Thanks in advance.