Page 116 of 206 Administration and maintenance
553-3001-304 Standard 3.00 September 2004
Adding a WLAN IP Telephony Manager 2245 to the system
When a WLAN IP Telephony Manager 2245 is added to the system, the
change is seamless and does not affect wireless handset calling ability.
A new WLAN IP Telephony Manager 2245 is detected within two seconds
of being added to the system (booted/configured/connected). When detected,
any wireless handset not on an active call is immediately forced to check out
and check in again. Any wireless handset in a call immediately switches to
the WLAN IP Telephony Manager 2245 that should provide its “timing”
function. This switchover should not be noticeable to the user since it is
similar to a normal handoff between APs. When the wireless handset ends the
call, it is forced to check out and check in again.
Checking in to the Gateway
When a wireless handset is checking in with the WLAN IP Telephony
Manager that is providing the Gateway function (not necessarily the same
WLAN IP Telephony Manager 2245 that is providing the timing function),
the wireless handset is assigned its Alias IP address. Subsequently when the
wireless handset checks in with the LTPS, the wireless handset identifies
itself with its new Alias IP address to the Call Server. If the wireless handset
is checking in again and again, it may indicate a problem on the network, such
as poor AP coverage for a user who is moving about. This information is
useful when troubleshooting.
Replacing a WLAN IP Telephony Manager 2245
Failed master WLAN IP Telephony Manager 2245
If the master WLAN IP Telephony Manager 2245 fails, then no telephone
calls can be made or received on that subnet. To quickly restore functionality
to the wireless telephone network, Nortel Networks recommends changing
the configuration of a slave WLAN IP Telephony Manager 2245 to the
configuration of the master’s. Then reset all the other slave WLAN IP
Telephony Managers 2245. When they come back up, the slaves recognize
the re-configured slave as the new master.
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