[on-asterisk] How to reset Aastra password?

[Bruce N]

Hi everyone,
 
The password for admin on an Aastra 6755i was set through a provision file. 
Password is forgotten and the provision file is not available. How can one 
reset the phone? Of course "factory fresh" from phone can't be done either 
without the password. Is there a telnet backdoor?
 
Thanks