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172 Troubleshooting WLAN IP Telephony installations
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.
•
Enable Multicast Support on the WLAN Security Switch 2270 to enable
use of the PTT feature for Nortel Handsets.
With the following settings, you can use Multicast for some of the
regular SVP server and PBX control traffic:
Switch > General: Ethernet Multicast Support = Enabled: (2.2)
Switch > General, Ports: click ports 1 edit on right hand side of the
screen and configure Multicast Appliance Mode = Enabled.
• Turn off Rogue AP Detection.
•
Turn off AutoRF unless you are running software from Cisco version
4.0.206.0 or later. If you are running version 4.0.206.0 or later,
configure the following additional parameters for AutoRF:
Parameter Setting Importance
Noise Measurement
3600
Required
Load Measurement
3600
Required
Signal Measurement
3600
Required
Coverage Measurement
3600
Required
• Verify that Idle timer is configured to 300 seconds.
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
NN43001-504 03.04 Standard
23 September 2008
Copyright © 2004–2008 Nortel Networks
.