Planning Page 43 of 206
WLAN IP Telephony Installation and Configuration
Gateway and timing function
WLAN IP Telephony Managers 2245 provide both the connection or
“gateway” to the Call Server for the wireless handsets and the “timing”
function for active calls. This “gateway” function is distributed across the
WLAN IP Telephony Manager 2245 group.
The number of active WLAN IP Telephony Managers 2245 is determined
dynamically. Whenever a WLAN IP Telephony Manager 2245 is added to or
removed from the system, the distribution of “timing” function for active
calls, as well as the “gateway” function, is affected.
Roaming and handover
Roaming is the ability of the wireless handset to go anywhere in the WLAN
Extended Service Set RF signal coverage area and to make and receive calls.
Handover is the ability of the wireless handset to maintain an active call
without interruption while moving within a WLAN Extended Service Set
(ESS) RF signal coverage area of a WLAN. This means that the wireless
handset hands over the WLAN RF signal from AP to AP without interrupting
the data stream.
APs on the same subnet
The WLAN Handset 2210/2211 can perform handover and roaming across
SVP-compliant APs that reside on the same subnet as the wireless handset
and WLAN IP Telephony Manager 2245 group.
APs on different subnets using WSS
When used in conjunction with a Nortel Networks WLAN Security Switch
(WSS) 2250/2270 and Nortel Networks APs 2230 operating in Layer 3 mode,
the WLAN Handsets 2210/2211 can perform roaming and handover across
APs 2230 on different subnets. The WSS 2270 operating in Layer 3 mode is
on the same subnet as the WLAN IP Telephony Manager 2245 group. The
WSS 2270 allows the wireless handset to retain its original IP address,
whether the IP address was configured statically or obtained by DHCP. This
means that roaming and handover can occur across APs 2230 placed on any
subnet.
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