Your access to emergency service through the phone depends on the phone being powered. If there is a power interruption, Service and Emergency Calling Service dialing will not function until power is restored. In case of a power failure or disruption, you may need to reset or reconfigure the equipment before using the Service or Emergency Calling Service dialing.
Phone Behavior During Times of Network Congestion
Anything that degrades network performance can affect phone voice and video quality, and in some cases, can cause a call to drop. Sources of network degradation can include, but are not limited to, the following activities:
Administrative tasks, such as an internal port scan or security scan
Attacks that occur on your network, such as a Denial of Service attack
Cisco Product Security Overview
This product contains cryptographic features and is subject to
United States and local country laws governing import, export, transfer, and
use. Delivery of Cisco cryptographic products does not imply third-party
authority to import, export, distribute, or use encryption. Importers,
exporters, distributors, and users are responsible for compliance with U.S. and
local country laws. By using this product you agree to comply with applicable
laws and regulations. If you are unable to comply with U.S. and local laws,
return this product immediately.