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
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
Release 5.0 15 June 2007
