This might help someone with the same issue with the T44U and auto provisioning.
The T46 template works but the y000000000108.cfg needs to be renamed to y000000000173.cfg and updated in the .boot file.
To get these working they had to be set in the '{$mac}.cfg' file:
static.security.user_password = {$admin_name}:{$admin_password}
static.security.sip.trust_certificates = 0
static.security.trust_certificates = 0
The T46 template works but the y000000000108.cfg needs to be renamed to y000000000173.cfg and updated in the .boot file.
To get these working they had to be set in the '{$mac}.cfg' file:
static.security.user_password = {$admin_name}:{$admin_password}
static.security.sip.trust_certificates = 0
static.security.trust_certificates = 0