[asterisk-users] Versions of Asterisk 1.6

[Cyprus VoIP]

Hello,

I see that there's 1.6.0.x and 1.6.1.y versions of Asterisk.

Is there a clear table that describes the features and/or differences 
between them?

Are both stable enough?

Is T.38 Fax supported on both? If yes, which spandsp is supported? I saw 
on voip-info.org that version 6 is not supported, but this information 
might be outdated.

Thanks.