111Administration and maintenanceThis section contains information about the following topics:• "Adding a WLAN IP Telephony Manager 2245 to the system" (page 111)• "Replacing a WLAN IP Telephony Manager 2245" (page 112)• "Removing a WLAN IP Telephony Manager 2245 from the system"(page 113)• "Changing the master WLAN IP Telephony Manager 2245" (page 113)• "Viewing software version" (page 113)• "Updating software" (page 114)• "Wireless handset download messages" (page 117)Adding a WLAN IP Telephony Manager 2245 to the systemWhen a WLAN IP Telephony Manager 2245 is added to the system, thechange is seamless and does not affect wireless handset calling ability.A new WLAN IP Telephony Manager 2245 is detected within two secondsof being added to the system (booted, configured, and connected). Whendetected, any wireless handset not on an active call is immediately forced tocheck out and check in again. Any wireless handset in a call immediatelyswitches to the WLAN IP Telephony Manager 2245 assigned to provideits timing function. This switchover is not usually noticeable to the userbecause it is similar to a normal handoff between APs. When the wirelesshandset ends the call, it is forced to check out and check in again.Checking in to the GatewayWhen a wireless handset is checking in with the WLAN IP TelephonyManager that is providing the Gateway function (not necessarily the sameWLAN IP Telephony Manager 2245 that is providing the timing function), thewireless handset is assigned its Alias IP address. Subsequently when thewireless handset checks in with the LTPS, the wireless handset identifiesitself with its new Alias IP address to the Call Server. If the wireless handsetNortel Communication Server 1000WLAN IP Telephony Installation and CommissioningNN43001-504 01.02 StandardRelease 5.0 15 June 2007Copyright © 2004-2007, Nortel Networks.
