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94 WLAN IP Telephony Manager 2245 configuration
If the WLAN Telephony Manager 2245 fails, the wireless handset drops
active calls, then re-registers with another WLAN IP Telephony Manager
2245 in their list. The wireless handsets return to active state after this
registration period. This failure does not affect other wireless handsets
registered on the other WLAN IP Telephony Manager 2245 units.
The recovery period for the wireless handsets on the failed WLAN IP
Telephony Manager 2245 is approximately 60 seconds.
The entire network is inoperative when new software downloads to the
network of WLAN IP Telephony Manager 2245 units. When the download
completes, the network comes back into service automatically.
This functionality requires the minimum software. See Table 12 "Minimum
software requirements" (page 94).
Table 12
Minimum software requirements
Device Minimum version
WLAN IP Telephony Manager 2245
174.034
WLAN Handset 2210/2211/2212
97.071
WLAN Handset 6120/6140
115.015
If either component is at an earlier release then the system works in the
current master or slave mode.
Functional description
The WLAN IP Telephony Manager 2245 provides the following services
to the handsets:
• It acts as a proxy for every wireless handset; that is, all UNIStim
signaling and RTP media to and from the wireless handset pass
through the WLAN IP Telephony Manager 2245. Except for the initial
DHCP and TFTP sessions, the wireless handsets only communicate
with the WLAN IP Telephony Manager 2245.
• The WLAN IP Telephony Manager 2245 server tags and untags
packets with the SVP header. SVP packets have the protocol byte
of the IP header configured to 0x77. SVP-compliant APs use this
proprietary tagging to give priority to tagged packets. For UDP
(UNIStim and RTP) packets going from the wireless handset to the
network, the WLAN IP Telephony Manager 2245 replaces the SVP
protocol number, 0x77, with the UDP number, 0x11. For packets
going from the network to the wireless handset, the protocol number is
changed from 0x11 to 0x77.
Because the packets that traverse the network between the wireless
handset and the WLAN IP Telephony Manager 2245 are not standard
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
NN43001-504 03.04 Standard
23 September 2008
Copyright © 2004–2008 Nortel Networks
.