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Handset switchover 31
affect the coverage area and capacity of the wireless system. Typically,
the requirements for use of handsets are similar to that of other wireless
data devices.
The APs must be either SVP-compliant or WMM-compliant to support QoS.
For a list of supported APs, see Appendix "Compatible Access Points"
(page 223).
Handset switchover
When a user on an active call is moving about, the call switches from AP to
AP in the subnet. This changeover is transparent to the user.
Loss of signal
If a wireless handset is out of range of all APs, it waits 20 seconds for a
signal to return. If a signal is not reacquired within 20 seconds, the wireless
handset loses connection to the Call Server and any calls are dropped.
When the wireless handset comes back into range of an AP, it reestablishes
a connection to the Call Server and goes through the system registration
process.
Note: If a wireless handset is out of contact with the system for
four seconds (worst case scenario) when the UNIStim messaging is
occurring, a UNIStim failure could result, causing the wireless handset
to lose the UNIStim association with the Line Telephony Proxy Server
(LTPS).
Handset switchover
If a user on an active call is moving about, the call switches from AP to AP
in the subnet. This changeover is transparent to the user.
Loss of signal
If a wireless handset is out of range of all APs, it waits 20 seconds for a
signal to return. If a signal is not reacquired within 20 seconds, the wireless
handset loses connection to the Call Server and any calls are dropped.
When the wireless handset comes back into range of an AP, it reestablishes
a connection to the Call Server and goes through the system registration
process.
ATTENTION
If a wireless handset is out of contact with the system for four seconds (worst case
scenario) during UNIStim messaging, a UNIStim failure could occur and cause
the wireless handset to lose the UNIStim association with the Line Telephony
Proxy Server (LTPS).
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
.