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Cisco 7921G Manual

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Connecting Your Phone
Cisco Unified Wireless IP Phone 7921G for Cisco Unified CallManager 4.1, 4.2, 5.0 and Later 13
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, refer to the Cisco Unified Wireless IP Phone 7921G
Accessory Guide and these web sites:
• http://www.plantronics.com
• http://www.jabra.com
Securing the Phone with a Lock Set and Cable Lock
You can secure the Cisco Unified Wireless IP Phone 7921G to a desk top by ordering the lock set from
Cisco. For more information, refer to the
Cisco Unified Wireless IP Phone 7921G Accessory Guide.
To install the lock set, use the diagram and follow these steps:
If you want to... Then...
Install the lock set on
the phone
1. Put the security cable around a post or through a hole in the desktop.
Insert the loops at the ends of the security cable through the C-ring.
2. Insert the C-ring with cable loops through the slot on back of phone.
3. Use the combination lock to secure the ends of the C-ring around cable
loops and phone.
The phone is secured to the desktop area.
4. To secure the desktop charger, use a laptop cable lock.
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