Cisco Cisco Unified Wireless IP Phone 7921G User Manual
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Connecting Your Phone
Cisco Unified Wireless IP Phone 7921G Phone Guide for Cisco Unified Communications Manager 7.0
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deployed, there is not a single “best” solution that is optimal for all environments. Cisco recommends
that customers test the headsets that work best in their environment before deploying a large number
of units in their network.
In some instances, the mechanics or electronics of various headsets can cause remote parties to hear
an echo of their own voice when they speak to Cisco Unified IP Phone users.
Cisco Systems recommends the use of good quality external devices, like headsets that are screened
against unwanted radio frequency (RF) and audio frequency (AF) signals. Depending on the quality of
these devices and their proximity to other devices such as cell phones and two-way radios, some audio
noise may still occur. See
Using External Devices, page 5
for more information.
The primary reason that a particular headset would be inappropriate for the Cisco Unified IP Phone
is the potential for an audible hum. This hum can be heard by either the remote party or by both the
remote party and you, the Cisco Unified IP Phone user. Some potential humming or buzzing sounds
can be caused by a range of outside sources, for example, electric lights, being near electric motors,
large PC monitors.
Audio Quality Subjective to the User
Beyond the physical, mechanical and technical performance, the audio portion of a headset must
sound good to you (the user) and to the party on the far end. Sound is subjective and Cisco cannot
guarantee the performance of any headsets, but some of the headsets on the sites listed below have
been reported to perform well on Cisco Unified IP Phones.
Nevertheless, it is ultimately the customer's responsibility to test this equipment in their own
environment to determine suitable performance.
For information about headsets for your phone, see th
and these web sites:
•