Headsets; Audio Quality - Cisco 7821 Administration Manual

Headsets

Procedure
Step 1 Insert the curved connectors into the lower slots.
Step 2
Lift the footstand until the connectors snap into the upper slots.
Note
Headsets
Although Cisco Systems performs internal testing of third-party headsets for use with Cisco IP Phones, Cisco
does not certify nor support products from headset or handset vendors.
The phone reduces some background noise that a headset microphone detects, but if you want to further reduce
the background noise and improve the overall audio quality, use a noise cancelling headset.
Cisco recommends the use of good quality external devices, for example, headsets that are screened against
unwanted radio frequency (RF) and audio frequency (AF) signals. Depending on the quality of headsets and
their proximity to other devices, such as mobile (cell) phones and two-way radios, some audio noise or echo
may still occur. Either the remote party or both the remote party and the Cisco IP Phone user may hear an
audible hum or buzz. A range of outside sources can cause humming or buzzing sounds; for example, electric
lights, electric motors, or large PC monitors.
In some cases, using a local power cube or power injector may reduce or eliminate hum.
Note
These environmental and hardware inconsistencies in the locations where Cisco IP Phones are deployed mean
that no single headset solution is optimal for all environments.
Cisco recommends that customers test headsets in the intended environment to determine performance before
making a purchasing decision and deploying on a large scale.
Related Topics
External Devices, on page 14

Audio Quality

Beyond physical, mechanical, and technical performance, the audio portion of a headset must sound good to
the user and to the party on the far end. Sound quality is subjective and Cisco cannot guarantee the performance
Cisco IP Phone 7821, 7841, and 7861 Administration Guide for Cisco Unified Communications Manager 10.0
(SIP)
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Connecting and disconnecting the footstand may require a little more force than you expect.