Loud Noise Environments; Quality Of Service (Qos) - Avaya Communication Server 1000 Installation And Commissioning Manual

Overview

Loud noise environments

The handsets are designed to provide optimal voice quality. However, when used in extremely
loud noise environments, (for example, close to working heavy machinery), degradation in call
quality can be experienced due to echo. Avoid using the handsets in loud noise environments.

Quality of Service (QoS)

Quality of Service is provided by using SpectraLink Voice Priority (SVP), WiFi Standard QoS, or
Cisco Client Extensions (CCX) version 4. You cannot mix these QoS modes within the same
WLAN; all Wireless Telephones on the network must have the same QoS setting.
SVP
SpectraLink Voice Priority is a proprietary method of WLAN QoS, developed by Polycom, to
ensure Enterprise-grade voice quality, battery life, and call capacity for Avaya 6120/6140
WLAN Handset. SpectraLink Voice Priority requires the WLAN IP Telephony Manager 2245,
which is an Ethernet LAN device that works in conjunction with WiFi APs to ensure QoS over
the WLAN. Voice packets to and from the Wireless Telephones are forwarded through the
WLAN IP Telephony Manager 2245 to ensure voice prioritization as they are routed between
the handset and an IP telephony server. For more information, see the SpectraLink WLAN
Telephony Manager 2245: Administration Guide within IP Environments.
WiFi Standard QoS
Avaya 6120/6140 WLAN Handset supports WMM, WMM Power Save, and WMM Admission
Control—all QoS standards from the WiFi Alliance based on IEEE 802.11e. The AP must
support and enable all three of these QoS mechanisms for the handset to work properly. If the
handset is configured for this option and the AP does not advertise all of these features, it
fails to operate. The combination of these three standards provides Enterprise-class QoS in
terms of voice quality, battery life, and call capacity. This option does not require the WLAN IP
Telephony Manager 2245.
CCXv4
The CCX program allows WLAN client devices operating on Cisco APs to take advantage of
Cisco-specific features. When the CCXv4 operating mode is selected on the handset, it
operates using the required set of Cisco-specific and industry standard QoS mechanisms. This
option does not require the WLAN IP Telephony Manager 2245.
36 Avaya WLAN IP Telephony Installation and Commissioning November 2010