Filter
Top Products
52 Planning
units may be required in that single subnet to support the number of calls;
however, fewer WLAN IP Telephony Manager 2245 units are needed than
in an equivalent multisubnet deployment.
A second advantage is that external security measures are easier and
less costly to implement. It is common practice to put a telephony WLAN
behind a firewall for security reasons. This is because security features
on handsets, particularly authentication capabilities, tend to lag behind
the industry. So to mitigate risks, you can use a firewall to block all but
the ports needed for IP Telephony. This practice becomes complex and
costly when multiplied by a number of subnets. A more cost-effective
alternative to implementing a firewall is to assign private addresses to
the handsets and let the WLAN IP Telephony Manager 2245 network
address translation (NAT) capabilities serve as a form of secure firewall
to the telephony LAN (T-LAN). Of course this is not as secure as using a
traditional firewall to secure the T-LAN.
The downside of putting all telephony devices into the same subnet is that
broadcasts are increased. Also, while security is simplified, the importance
of implementing adequate security measures increases because more
devices will be impacted in the event of a security breach.
Note: Nortel does not recommend running the WLAN IP Telephony
Manager 2245 behind a firewall. Any routing device introduces a
possibility of delay, and the higher layer routing tends to introduce longer
and less predictable delays. Regularly timed packets are important in
order to assure optimum voice quality, so Nortel recommends putting
as little and as simple networking equipment between the WLAN IP
Telephony Manager 2245 and the phones as possible.
WLAN IP Telephony Manager 2245 planning
Both the WLAN IP Telephony Manager 2245 and the WLAN Application
Telephony Gateway 2246 are connected to the Ethernet switch.
Installation requirements
The WLAN IP Telephony Manager 2245 requires a CAT5 cable
connection between its network port and the Ethernet switch. The WLAN
IP Telephony Manager 2245 can autonegotiate to the type of port on
the Ethernet switch. It supports 10BaseT, 100BaseT, full-duplex and
half-duplex port types.
Nortel recommends 100BaseT full-duplex.
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
NN43001-504 03.04 Standard
23 September 2008
Copyright © 2004–2008 Nortel Networks
.