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100 WLAN IP Telephony Manager 2245 configuration
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.
•
The WLAN IP Telephony Manager 2245 server tags and untags packets
with the SVP header. SVP packets have the protocol byte of the IP
header configured to 0x77. SVP-compliant APs use this proprietary
tagging to give priority to tagged packets. For UDP (UNIStim and RTP)
packets going from the wireless handset to the network, the WLAN IP
Telephony Manager 2245 replaces the SVP protocol number, 0x77,
with the UDP number, 0x11. For packets going from the network to the
wireless handset, the protocol number is changed from 0x11 to 0x77.
Because the packets that traverse the network between the wireless
handset and the WLAN IP Telephony Manager 2245 are not standard
IP packets (the packets use a nonstandard protocol number), there can
be no Layer 3 routing in the path. Therefore, the wireless handsets and
WLAN IP Telephony Managers 2245 must be in the same logical subnet.
• RTP packets between the wireless telephone and the WLAN IP
Telephony Manager 2245 always contain 30 ms worth of voice, no
matter what is configured on the Call Server. The WLAN IP Telephony
Manager 2245 repackages the RTP packets to conform to the size that
is configured in the Call Server. This provides more efficient use of the
available Radio Frequency (RF) bandwidth at the expense of slightly
increased jitter and latency.
•
The WLAN IP Telephony Manager 2245 is configured with a maximum
allowable number of simultaneous media streams on a single AP. The
WLAN IP Telephony Manager 2245 keeps track of the number of media
streams on each AP and blocks calls to and from a wireless handset
that would exceed the configured capacity. For more information about
call blocking, see "Call blocking" (page 79).
•
The WLAN IP Telephony Manager 2245 has limitations for high
availability. There are some types of failure that can result in complete
outages. Every group of WLAN IP Telephony Manager 2245s in a single
subnet has a master node. If this node fails or if connectivity to it is lost,
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
NN43001-504 01.02 Standard
Release 5.0 15 June 2007
Copyright © 2004-2007, Nortel Networks
.