Safety And Performance Information; Power Outage; External Devices - Cisco 6921 User Manual

Product Safety, Security, Accessibility, and
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Safety and Performance Information

Power outages and other devices can affect your Cisco Unified IP Phone.

Power Outage

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.

External Devices

Cisco recommends using good quality external devices such as headsets, cables, and connectors that are
shielded against unwanted radio frequency (RF) and audio frequency (AF) signals.
Not all Cisco IP Telephony products support external devices, cords or cables. For more information,
Note
consult the documentation for your phone.
Depending on the quality of these devices and their proximity to other devices such as mobile phones or
two-way radios, some audio noise may still occur. In these cases, Cisco recommends that you take one or
more of these actions:
Safety and Performance Information, page 101
Cisco Product Security Overview, page 102
Accessibility Features, page 102
Additional Information, page 102
Cisco Unified IP Phone 6921, 6941, 6945, and 6961 User Guide for Cisco Unified Communications Manager 9.0 (SCCP
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C H A P T E R
and SIP)
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