User's Manual

We recommend 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 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 phone user.
Some potential humming or buzzing sounds can be caused by a range of outside sources, for example, electric
lights, electric motors, or large PC monitors. 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 phone users.
Related Topics
Make a Call with a Headset, on page 24
Standard Headsets
You can use a wired headset with your phone. The headset requires a 2.5 mm, 3-band, 4-connector plug.
If you plug a headset into the phone during an active call, the audio path automatically changes to the headset.
Bluetooth Headsets
You can use a Bluetooth headset with your phone.
Using Bluetooth wireless headsets likely increases battery power consumption on your phone and may result
in reducing battery life.
For a Bluetooth wireless headset to work, it does not need to be within direct line-of-sight of the phone, but
some barriers, such as walls or doors, and interference from other electronic devices, can affect the connection.
Related Topics
Access Bluetooth Settings, on page 67
Bluetooth and Your Phone, on page 12
Cisco Wireless IP Phone 8821 Desktop Charger
You can use the Cisco Wireless IP Phone 8821 Desktop Charger to charge your phone and spare phone battery.
The charger has these features:
•
Works on line power or from a charged spare phone battery.
•
Contains a speakerphone that the docked phone can use.
◦
The phone volume buttons control the volume of the speakerphone
◦
The charger has a Mute button built into it on the lower right corner. When the speakerphone is
muted, the Mute button lights red.
•
Charges the docked phone battery.
◦
If the phone is turned on when you put it into the charger, the LED on the top of the phone lights
red and you see a message on the screen.
Cisco Wireless IP Phone 8821 and 8821EX User Guide
72
Accessories
Standard Headsets