With the recent introduction of patch 3 for Aastra XML scripts 2.2.1 we now have scripts that work on Asterisk 1.6 as well as 1.4.  The installation procedure has also been greatly simplified.  There are at least two bugs in patch 3 that I am sure Aastra will eventually fix but for now I will provide the information

In previous posts I showed how to auto-provision and configure Aastra phones by manually installing XML scripts.  Aastra has released RPM packages for Trixbox that combines everything and adds new features as well as mDNS so the phones can find the TFTP server even if you don't have a DHCP server capable of assigning it.  The script won't install unless mDNS is installed. 

So you got a brand spanking new Aastra 5xi phone that you want to connect to your Asterisk PBX. Implementing XML on your phones opens up a whole world of possibilities. I'll show you how to do it.

These have all been tested on my Aastra 57i phone. It should work on the 55i as well. I am not sure what will work on other phones. Some things will and some things won't.