Cisco Unified IP Phone 7921 - Manual (Page 9)

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When you move the phone out of signal range, you lose connection with the wireless LAN. The icon appears, and the status
line displays, “Leaving service area.”
Tip
Your idle phone screen can turn off after a time interval. To alert you that the phone is still powered on and connected to the
wireless network when using battery power, the indicator light blinks green every 2 seconds.
Accessories for the Cisco Unified Wireless IP Phone 7921G
The following phone accessories are available for your phone:
• Standard and extended batteries
• AC power supplies for different geographical areas
• Desktop charger with speakerphone
• Carrying cases
• Lock sets
For a complete list and description of accessories, refer to this guide: Cisco Unified Wireless IP Phone 7921G Accessory Guide .
Headset Information
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.
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.
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: