Cisco ATA 186 Administrator's Manual page 28

Installation and Configuration Overview
Action
6. Power up the Cisco ATA.
Periodically, you can upgrade the Cisco ATA to a new signaling
7.
image by using the TFTP server-upgrade method or the
manual-upgrade method.
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide (H.323)
1-10
Chapter 1 Cisco Analog Telephone Adaptor Overview
Reference
Chapter 8, "Upgrading the Cisco ATA Signaling
Image"
OL-4008-01