Cisco 7925G Administration Guide - Page 38

Bluetooth Wireless Technology Chapter 2 Overview of the VoIP Wireless Network 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 Note In dual band WLANs, it is possible to roam between 2.4 GHz bands (802.11b/g) and 5 GHz bands (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 • Voice QoS in a Wireless Network, page 2-12 • Configuring the Wireless Network for Voice, page 2-22 • VoIP WLAN Configuration, page 2-21 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: • 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. 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 OL-15984-01