Cisco 7921G Power Supply for United Kingdom CP-PWR-7921G-UK= Manual De Usuario
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Headset Information
To use a headset, see
. Although Cisco Systems
performs some internal testing of third-party headsets for use with the Cisco Unified IP Phones, Cisco
does not certify or support products from headset or handset vendors. Because of the inherent
environmental and hardware inconsistencies in the locations where Cisco Unified IP Phones are
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.
does not certify or support products from headset or handset vendors. Because of the inherent
environmental and hardware inconsistencies in the locations where Cisco Unified IP Phones are
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.
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
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
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.
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.
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.
environment to determine suitable performance.
For information about headsets for your phone, see the
and these web sites:
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