Bluetooth Wireless Technology; Pairing Headsets - Cisco 7925G - Unified Wireless IP Phone VoIP Administration Manual

Bluetooth Wireless Technology

In dual band WLANs, it is possible to roam between 2.4 GHz bands (802.11b/g) and 5 GHz bands
Note
(802.11a). The phone moves out of range of one AP using one band and into the range of another that
has the same SSID but is using a different band. This can cause gaps in voice communications. To avoid
these communication gaps, try to use only one band for voice communications.
Related Topics
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Bluetooth Wireless Technology

Bluetooth Class 2.0 with Extended Data Rate (EDR) is a short-range wireless technology that is
supported by the Cisco Unified Wireless IP Phone 7925G. It supports the Hands-Free Profile version 1.5.
Your Cisco Unified Wireless IP Phone 7925G is a qualified Bluetooth wireless device (Qualified Device
ID (QDID) B014396) and provides voice communication over the same wireless LAN that your
computer uses.
Bluetooth enables low bandwidth wireless connections within a range of 10 meters. The best
performance is in the 1 to 2 meter range. Synchronous voice channels are provided by using circuit
switching and asynchronous data channels are provided by using packet switching.
Bluetooth wireless technology operates in the 2.4 GHz band which is the same as the 802.11b/g band.
There can be a potential interference issues. It is recommended that you:
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Pairing Headsets

The Cisco Unified Wireless IP Phone 7925G pairs with headsets using a shared key authentication and
encryption method. The authentication process can require a personal identification number (PIN)
specific to the headset, commonly "0000." The Cisco Unified Wireless IP Phone 7925G can be paired
with more than one headset at a time. Pairing is typically performed once for each headset.
Cisco Unified Wireless IP Phone 7925G Administration Guide for Cisco Unified Communications Manager 7.0(1)
2-8
CCKM, a centralized key management protocol, provides a cache of session credentials on the
wireless domain server (WDS). As the phone roams from one AP to the next, CCKM compresses
the number of message exchanges during roaming by providing a master key stored on the WDS for
the AP to use. The reassociation exchange is reduced to two messages, thereby reducing the roaming
time.
For details about CCKM, refer to the "Cisco Fast Secure Roaming Application Note" at:
http://www.cisco.com/en/US/products/hw/wireless/ps4570/prod_technical_reference09186a00801
c5223.html
Voice QoS in a Wireless Network, page 2-12
Configuring the Wireless Network for Voice, page 2-22
VoIP WLAN Configuration, page 2-21
Use 802.11a that operates in the 5 GHz band.
Reduce the proximity of other 802.11b/g devices, Bluetooth devices, microwave ovens, and large
metal objects.
Use the Cisco Unified Wireless IP Phone 7925G on the same side of the body as the
Bluetooth-enabled headset.
Chapter 2 Overview of the VoIP Wireless Network
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