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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.
Access points on the same subnet
The handset 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.
Mobility across different subnets when using DHCP
If a WSS is not in use and the wireless handset IP address is acquired
through DHCP, the wireless handset must be powered down and powered
up when entering a new subnet. This enables functionality of the wireless
handset when entering the WLAN RF signal coverage area of a different
WLAN IP Telephony Manager 2245 group on a different subnet. After the
wireless handset establishes communication within the Extended Service
Set Identifier (ESSID) of the new WLAN, obtains another IP address from
the DHCP server, and normal functionality returns. If the wireless handset
is configured to use ESSID of the new WLAN, it automatically discovers
the ESSID of the APs operating in broadcast mode.
Table 5 "Roaming and handover capabilities summary" (page
58) summarizes the capabilities.
Table 5
Roaming and handover capabilities summary
IP address
WSS in use
Roaming capability Handover capability
Static No No No
Static Yes Yes Yes
DHCP No Yes, if the wireless ha
ndset is power-cycled
between subnets.
No
DHCP Yes Yes Yes
Multicast
IP multicast addresses are used by the WLAN Handset 2211 and the
WLAN IP 6120 Handset Push-to-talk (PTT) feature. The use of IP
multicast addresses requires that multicasting be enabled on the Layer
2 switch used by the defined group (WLAN IP Telephony Manager 2245
units and wireless handsets).
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
NN43001-504 03.04 Standard
23 September 2008
Copyright © 2004–2008 Nortel Networks
.