Page 68 of 206 WLAN IP Telephony Manager 2245 configuration
553-3001-304 Standard 3.00 September 2004
SVP is required for QoS because the current IEEE 802.11b wireless LAN
standard provides no mechanism for differentiating audio packets from data
packets. This standard is undergoing revision to version 802.11e to provide
functionality in an industry standard similar to SVP, therefore ensuring high-
quality voice in a mixed-client environment.
Functional description
The WLAN IP Telephony Manager 2245 provides the following services to
the WLAN Handsets 2210/2211:
• It acts as a proxy for every wireless handset; that is, all UNIStim
signaling and RTP media to/from the wireless handset pass through the
WLAN IP Telephony Manager 2245. Except for the initial DHCP and
TFTP sessions, the wireless handsets only communicate with the WLAN
IP Telephony Manager 2245.
Each WLAN IP Telephony Manager 2245 is configured with an IP
address with which all of the wireless handsets communicate. In
addition, each WLAN IP Telephony Manager 2245 is configured with a
pool of IP addresses. When a wireless handset registers with a WLAN IP
Telephony Manager 2245, the wireless handset is assigned one of the IP
addresses from the pool. All communication between this WLAN IP
Telephony Manager 2245 and other devices (TPS, IP Phones, gateways,
and other wireless handsets) is always done through its pool IP address.
In this sense, the WLAN IP Telephony Manager 2245 acts as a NAT
(Network Address Translation)
Note: The WLAN IP Telephony Manager 2245 has a single physical
Ethernet interface and MAC address; therefore, all of the IP addresses are
mapped to a single MAC address.
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