Bluetooth Technology; Handsfree Profile - Cisco 7925G - Unified Wireless IP Phone VoIP Administration Manual

Bluetooth Technology

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Bluetooth Technology
The Cisco Unified Wireless IP Phone 7925G is a full-feature telephone and a qualified Bluetooth
wireless device (Qualified Device ID (QDID) B014396). In addition to basic call-handling features, your
phone operates with Bluetooth wireless headsets, including certain handsfree call features.
Bluetooth devices operate in the unlicensed Industrial Scientific Medicine (ISM) band of 2.4GHz. This
unlicensed band in most countries includes the frequency range from 2400 to 2483.5 MHz. Synchronous
voice channels are provided by using circuit switching and asynchronous data channels are provided by
using packet switching.
Bluetooth uses an integrated Adaptive Frequency Hopping (AFH) to avoid interference. Every 625 usec
(1/1,000,000 of a second) the channel changes or hops to another frequency within the 2402 to 2480
MHz range. This computes to 1600 hops every second.
On the Cisco Unified Wireless IP Phone 7925G, a Bluetooth module and 802.11 WLAN module co-exist
in the phone. This co-existence greatly reduces and avoids radio interference between the Bluetooth and
802.11bg radio.
Bluetooth devices fit into to three different power classes, as shown in
Table 1-1
Class
Class 1
Class 2
Class 3
For more information about WLAN configuration and Bluetooth, see
page
Guide.
For more information about Bluetooth and hands-free profiles, refer to http://www.bluetooth.com.

Handsfree Profile

Your phone supports certain features of the Handsfree Profile, which is a standard set of features that
enable users of handsfree devices (such as Bluetooth wireless headsets) to perform certain tasks without
having to handle the phone, allowing users to be "handsfree." For example, instead of pressing Redial
on your phone, you can redial a number from your Bluetooth wireless headset according to instructions
from the headset manufacturer.
These handsfree features apply to Bluetooth wireless headsets used with your Cisco Unified Wireless IP
Phone 7925G:
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Cisco Unified Wireless IP Phone 7925G Administration Guide for Cisco Unified Communications Manager 7.0(1)
1-2
Dust resistance
Shock proof and vibration proof
USB 1.1 interface
Bluetooth Maximum Permitted Power and Range by Class
Maximum Permitted Power (dBm)
100 mW
2.5 mW
1 mW
2-21. User-specific information is contained in the Cisco Unified Wireless IP Phone 7925G User
Redial—Recalls the last number dialed.
Reject incoming call—Uses the iDivert option to direct the call to voicemail.
Chapter 1 Overview of the Cisco Unified Wireless IP Phone 7925G
Table
Maximum Permitted Power (mW) Range
20 dBm
4 dBm
0 dBm
VoIP WLAN Configuration,
1-1.
Up to 100 meters
Up to 10 meters
Up to 1 meter
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