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Cisco ATA 187 Analog Telephone Adaptor Administration Guide for SIP (Version 1.0)
OL-21862-01
Chapter 2 Preparing to Install the ATA 187 on Your Network
Providing Power to the ATA 187
Understanding How the ATA 187 Interacts with Cisco Unified Communications
Manager
Cisco Unified Communications Manager is an open and industry-standard call processing system.
Cisco
Unified Communications Manager software sets up and tears down calls between phones
connected to the ATA 187, integrating traditional PBX functionality with the corporate IP network.
Cisco
Unified Communications Manager manages the components of the IP telephony system—the
phones, the access gateways, and the resources necessary for features such as call conferencing and route
planning. Cisco
Unified Communications Manager also provides:
• Firmware for devices
• Authentication and encryption (if configured for the telephony system)
• Configuration and CTL files via the TFTP service
• Phone registration
• Call preservation, so that a media session continues if signaling is lost between the primary
Communications Manager and a phone
For information about configuring Cisco Unified Communications Manager to work with the IP devices
described in this chapter, see Cisco Unified
Communications Manager Administration Guide, Cisco
Unified Communications Manager System Guide, and Cisco Unified Communications Manager Security
Guide.
Providing Power to the ATA 187
The ATA 187 is powered with external power. External power is provided through a separate power
supply.
The following sections provide more information about powering a ATA 187:
• Power Guidelines, page 2-2
• Power Outage, page 2-2
• Understanding Phone Configuration Files, page 2-3
Power Guidelines
The following power type and guideline applies to external power for the ATA 187:
• Power Type—External power (Provided through the Universal AC external power supply)
• Guidelines—The ATA 187 uses the Universal AC power supply 110/240V
Power Outage
Your accessibility to emergency service through the phone is dependent on the phone being powered. If
there is an interruption in the power supply, Service and Emergency Calling Service dialing will not
function until power is restored. In the case of a power failure or disruption, you may need to reset or
reconfigure equipment before using the Service or Emergency Calling Service dialing.