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178 Appendix B Troubleshooting WLAN IP Telephony installations
Nortel switches
This section contains configuration information for Nortel switches.
Nortel WLAN Security Switch
The 2350, 2360, and 2380 model switches have the following requirements:
•
load 4.1.14
• configure radio-profile voice dtim-interval 3
•
configure radio-profile voice active-scan disable (prevents the AP from
going off-channel to scan)
•
radio-profile voice WMM enabled
Cisco access points and switches
This section contains configuration information for selected Cisco access
points and switches.
Cisco Aironet 1200 Series
Ensure that the software is 12.3.7(JA3). This requirement is current as of
November 2006 and is subject to change.
Configure the following settings:
•
dtim-interval 3
•
protocol 119 enabled
•
less than 10 ms voice latency
•
voice WMM enabled
For more information, see the Cisco Aironet 1200 Series User Guide.
Nortel WLAN Security Switch 2270 and the Cisco 4400 Series
WLAN Controller
Alpha The 2270 and 4400 infrastructure has the following requirements:
•
Turn off aggressive load balancing.
•
Disable MAC filtering authentication for voice SSID and use only static
WEP (40 or 104 bit) encryption.
•
Configure 802.11b radio data rates as follows:
— 1Mb/s—Mandatory
— 2Mb/s—Mandatory
— 5.5Mb/s—Supported
— 11Mb/s—Supported
•
Uncheck enable short preamble.
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
NN43001-504 01.02 Standard
Release 5.0 15 June 2007
Copyright © 2004-2007, Nortel Networks
.