Hi,
You are right !!! It is a real pain, but i got it now. The Solution was to find the right image and to change OS79XX.TXT, SIPDefault.cnf and XMLDefault.cnf.xml under IP Devices and make an Extension with the MAC of the Phone.
Just one thing i had to change manually to get the phone provisioning, it was to change SIP00:0F:08:D1:B3:C4.cnf to SIP000F08D1B3C4.cnf
Thanks !
fpausp