While using a Cisco ATA 187 (SIP) on my VOIP network (CMBE 8.5), I am getting a status message of:
No CTL installed
File Not Found : CTLSEP18758A28C701.tlv
There should be no problem with the ATA. I am told that the CTL###.tlv is only used when the ATA is running with a secured CUCM cluster. Since the ATA has the same firmware for CME and CM you will see this error in the status messages.