Help With T48 Provision

[yivgeny]

Hello,
Configure dhcp provision, it's go correct to tftp server.
Found from tftp logs:
T48 ask file MAC-ADDRESS.boot - that not exist
then ask - y000000000000.boot
then ask xxx.cfg file.
Why it's not ask MAC-ADDRESS.cfg file?
How i need to change y000000000000.boot that for every phone it's will ask MAC-ADDRESS.cfg file ?
My y000000000000.boot is:

#!version:1.0.0.1
## The header above must appear as-is in the first line

include:config <xxx.cfg>
include:config "xxx.cfg"

overwrite_mode = 1

Thank you.