Cisco ATA186-I1 Installation And Configuration Manual page 53

Chapter 3 Configuring the Cisco ATA 186
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DNS, TFTP, and NTP servers can be overwritten by the value of the
corresponding parameters in the local box profile (for example, the DNS1IP,
DNS2IP, TftpURL, and NTPIP parameters).
If you are not using DHCP, you must manually enter the IP address, network route
address, and subnet mask.
OL-1267-01
Network time protocol (NTP) servers—DHCP option 42
(The Cisco ATA 186 takes up to two NTP servers)
TFTP server name—DHCP option 66
Cisco ATA 186 Installation and Configuration Guide
About Using the DHCP Server
3-9