Audio Quality - Cisco 7800 series Administrator's Manual

Headsets
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, use of a local power cube or power injector may reduce or eliminate hum.
Note
Environmental and hardware inconsistencies in the locations where Cisco IP Phones are deployed mean that
no single headset solution is optimal for all environments.
We recommend that customers test headsets in the intended environment to determine performance before
making a purchasing decision and deploy 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
of any headsets. However, a variety of headsets from leading headset manufacturers are reported to perform
well with Cisco IP Phones.
For additional information, see
accessories.html
Analog Headsets
Analog headsets are supported on the Cisco IP Phone 7821, 7841, and 7861. However, the Cisco IP Phone
7821, 7841, and 7861 cannot detect when an analog headset is plugged in. For this reason, the analog headset
displays by default in the Accessories window on the phone screen.
Displaying the analog headset as the default allows users to enable wideband for the analog headset.
Enable Wideband on Analog Headsets
Although analog headsets are supported on the phone, the phones cannot detect when an analog headset is
plugged in. For this reason, by default, the analog headset displays in the Accessories window on the phone
screen.
Displaying the analog headset as the default allows users to enable wideband for the analog headset.
The phone is unable to detect whether the headset supports the wideband codec, but the user can enable
wideband on analog headsets by following these steps:
Cisco IP Phone 7800 Series Administration Guide for Cisco Unified Communications Manager
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http://www.cisco.com/c/en/us/products/unified-communications/uc_endpoints_