Differents versions of Asterisk

Hi all, i’m a french student and in order to make a rapport about Asterisk, i want to compare different versions of the software.

I would like to know what are the main differences between versions 1.2, 1.4 and if possible 1.6.

I hope somebody can help me because my search on Internet was successless.
Excuse me for my poor english

Adrien Bourroux

Go to asterisk.org and check the changelogs and upgrade files

Ian