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176 Troubleshooting WLAN IP Telephony installations
Table 23
1230 connected with 3560 and 2245 connected with 6509 (cont’d.)
AP:1230 3650 connected to APs 6509 connected to 2245
3
int fastethernet 0.240
encapsulation dot1Q
240 service-policy input
wireless-SVPVoIP
interface fastethernet 01
priority-queue out mls qos
trust cos
class-map match-all voice-sig
match access-group 100
4
(for return path) dot11
priority-map avvid
access-list 100 permit udp
172.23.0.016 eq 5000
172.23.0.016
5
class-map match-all voice-bearer
match access-group 101
6
access-list 101 permit udp
172.23.0.016 eq 5200
172.23.0.016
7
policy-map trust -voice-2245
class voice-sig
set ip dscp 40
class voice-bearer
set ip dscp 46
8
int fastethernet 03 (the port that is
connected with 2245)
switchport access vlan xx
switchport mode access
mls qos trust cos
mls qos cos 5
service-policy input trust-voice-2
245
General WLAN configuration
The following is a list of considerations for general WLAN configuration:
• Multicast must be configured in any WLAN for Push-to-talk (PTT) on
the WLAN Handset 2211.
• APs use channels 1, 6, and 11.
• APs require a 15-20dB separation for like channels to avoid cochannel
interference.
• A one-way Performance domain is required (handset to call server):
Max 100 ms delay, Max 30 ms jitter, and Max 2% packet loss.
• The WLAN IP Telephony Manager 2245 to AP link is (ideally) limited to
100 ms delay, 1 ms jitter and under 2% packet loss.
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
NN43001-504 03.04 Standard
23 September 2008
Copyright © 2004–2008 Nortel Networks
.