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22 Overview
Application Interface (OAI) messaging protocol. The WLAN Application
Gateway 2246 forwards the messages to the WLAN IP Telephony
Manager, which encapsulates the message for delivery to the handset.
If text-messaging functions are programmed, the handset can receive text
messages. While you access text messages, the handset is in messaging
mode. Incoming calls ring with the second call-ringing sound.
Loud noise environments
The handsets are designed to provide optimal voice quality. However,
when used in extremely loud noise environments, (for example, close to
working heavy machinery), degradation in call quality can be experienced
due to echo. Avoid using the handsets in loud noise environments.
WLAN IP Telephony Manager 2245
The WLAN IP Telephony Manager 2245 is a device that manages IP
telephony network traffic on the WLAN system. It is required to utilize
the 11Mbs maximum transmission speed available in the handsets. The
WLAN IP Telephony Manager 2245 acts as a proxy for the wireless
handsets. It provides a number of services including a QoS mechanism,
AP bandwidth management, and efficient RF link utilization.
The WLAN IP Telephony Manager 2245 works with the APs to provide
Quality of Service (QoS) on the WLAN. All voice packets are encapsulated
by the wireless handsets. The encapsulated voice packets to and from the
wireless handsets are handled by the WLAN IP Telephony Manager 2245
and routed to and from a Call Server.
SpectraLink Voice Priority (SVP) is the QoS mechanism implemented on
the wireless handsets and APs to enhance voice quality over the wireless
network. SVP gives preference to voice packets over data packets on
the wireless medium, increasing the probability that all voice packets are
transmitted and with minimum delay. SVP is fully compliant with the IEEE
802.11 and 802.11a, b, and g standards.
Nortel does not support use of ICMP Network Redirection with VoWLAN
applications due to degraded routing and network performance. The
Nortel 2245, upon receiving an ICMP redirect, will update its routing
table and attempt to send packets through the new route, however this is
not instantaneous. As per the RFC, the route is not permanent and will
eventually revert to using the default gateway.
Each subnet, where the wireless handsets operate, requires at least one
WLAN IP Telephony Manager 2245. One standalone unit can process
up to 80 simultaneous calls depending on the model, as listed in Table 1
"WLAN Telephony Manager 2245 model numbers and capacities" (page
23). If greater capacity is required, multiple units can be used
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
NN43001-504 03.04 Standard
23 September 2008
Copyright © 2004–2008 Nortel Networks
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