Chapter - Cisco ATA 191 Administration Manual

Analog telephone adapter
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ATA 191 Startup Process
Task
2
3
4
5
6
Cisco ATA 191 Analog Telephone Adapter Administration Guide for Cisco Unified Communications Manager
18
Loading the Stored Image.
The Cisco ATA 191 has nonvolatile flash memory
in which it stores firmware images and user-defined
preferences. At startup, the ATA 191 runs a
bootstrap loader that loads an ATA 191 image
stored in flash memory. Using this image, the ATA
191 initializes its software and hardware.
Obtaining an IP Address.
If the Cisco ATA 191 is using DHCP to obtain an
IP address, the device queries the DHCP server to
obtain one. If you are not using DHCP in your
network, assign static IP addresses to each device
locally.
Requesting the CTL file.
The TFTP server stores the CTL file. This file
contains the certificates necessary for establishing
a secure connection between the device and Cisco
Unified Communications Manager.
Requesting the Configuration File.
The TFTP server has configuration files, which
define parameters for connecting to Cisco Unified
Communications Manager and other information
for the ATA 191.
Contacting Cisco Unified Communications
Manager.
The configuration file defines how the ATA 191
communicates with Cisco Unified Communications
Manager and provides a device with its load ID.
After obtaining the file from the TFTP server, the
device attempts to make a connection to the highest
priority Cisco Unified Communications Manager
on the list. If the device is configured for secure
signaling (encrypted or authenticated), and the
Cisco Unified Communications Manager is set to
Mixed (security) mode, the device makes a TLS
connection. Otherwise, it makes a nonsecure
TCP/UDP connection.
Prepare to Install the ATA 191 on Your Network
Related Topics
See the "Cisco CTL Client Setup" chapter
of the Security Guide for Cisco
Unified Communications Manager at:
https://www.cisco.com/c/en/us/support/
unified-communications/
unified-communications-manager-callmanager/
products-maintenance-guides-list.html
See
Phone Configuration Files, on page
16
.
See
Phone Configuration Files, on page
16.

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