Bluetooth; Bluetooth Profiles; Coexistence (802.11B/G + Bluetooth) - Cisco 9971 Deployment Manual

Bluetooth

The Cisco Unified IP Phone 9971 supports Bluetooth Class 2 technology allowing for wireless headset communications.
Bluetooth enables low bandwidth wireless connections within a range of 30 feet, however it is recommended to keep the
Bluetooth device within 10 feet of the phone.
Up to five headsets can be connected, but only the last one connected is used as the default.
The Bluetooth device does not need to be within direct line-of-sight of the phone, but barriers, such as walls, doors, etc. can
potentially impact the quality.
Bluetooth utilizes the 2.4 GHz frequency just like 802.11b/g and many other devices (i.e. microwave ovens, cordless phones,
etc.), so the Bluetooth quality can potentially be interfered with due to using this unlicensed frequency.

Bluetooth Profiles

The Cisco Unified IP Phone 9971 supports both the Bluetooth Headset and Handsfree Profiles.
With a Bluetooth Headset Profile capable headset, the following call functions can be performed.
-Ring
-Answer a call
-End a call
-Volume Control
With Bluetooth Handsfree Profile (HFP) support, the following features can also be available if supported by the Bluetooth headset.
-Last Number Redial
-Call Waiting
-Divert / Reject
-3 way calling (Hold & Accept and Release & Accept)
For more information, refer to the documentation from the Bluetooth headset manufacturer.

Coexistence (802.11b/g + Bluetooth)

If using Coexistence where 802.11b/g and Bluetooth are used simultaneously, then there are some limitations and deployment
requirements to be considered as they both utilize the 2.4 GHz frequency.
Capacity
When using Coexistence (802.11b/g + Bluetooth), call capacity is reduced due to the utilization of CTS to
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protect the 802.11g and Bluetooth transmissions.
Multicast Audio
Multicast audio from Push To Talk (PTT), Music on Hold (MMOH) and other applications are not supported
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when using Coexistence.
Data Rate Configuration
It is recommended to only enable 802.11g (OFDM) data rates (i.e. > 12 Mbps) to prevent from engaging in
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CTS for 802.11g protection when using Coexistence, which can impact voice quality.
Cisco Unified IP Phone 9971 Wireless LAN Deployment Guide 12