Chapter 3 Setting Up the Cisco Unified IP Phone
Installing the Cisco Unified IP Phone
3-6
Cisco Unified SIP Phone 3911 Administration Guide for Cisco Unified Communications Manager
OL-14029-01
The primary reason that support of a headset would be inappropriate for an
installation is the potential for an audible hum. This hum can either be heard by
the remote party or by both the remote party and 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. In some cases, a hum experienced by a user may be reduced or
eliminated by using the Cisco Unified IP Phone Power Cube 3
(CP-PWR-CUBE-3).
Audio Quality Subjective to User
Beyond the physical, mechanical and technical performance, the audio portion of
a headset must sound good to the user and the party on the far end. Sound is
subjective and Cisco cannot guarantee the performance of any headsets or
handsets, but some of the headsets and handsets on the sites listed below have
been reported to perform well on Cisco Unified IP Phones.
Nevertheless, it is ultimately still the customer's responsibility to test this
equipment in their own environment to determine suitable performance.
Connecting a Headset
To connect a headset to the Cisco Unified SIP Phone 3911, plug it into the RJ-9
Handset port on the back of the phone. Depending on headset manufacturer's
recommendations, an external amplifier may be required. Refer to headset
manufacturer's product documentation for details.
You can use the headset with all of the features on the Cisco Unified IP Phone,
including using the Volume button.
Installing the Cisco Unified IP Phone
You must connect the Cisco Unified IP Phone to the network and to a power
source before using it. See
Figure 3-1
for a graphical representation of the
connections.
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