[Asterisk-Dev] How to avoid CTL file request for Cisco 7970

[Parfenenok Sergey]

Hi All!
We buy Cisco 7970 and have a problem. At startup phone requests CTL file 
and hangs with message
"Updating CTL". Nothing more happens after it. I tried to place dummy 
file with the name
CTLSEP<mac addr>.tlv to TFTP root directory. Cisco found it and then 
message changed to
"CTL update failed".  Some people here told that they can succesfuly 
register this phone on Asterisk.

What can I do to avoid this problem?