Nortel Meridian 1 Description, Installation And Operation page 29

Description Page 29 of 262
In a H.323 network, each Gatekeeper controls one H.323 zone; each H.323
zone consists of many H.323 IP clients, and many Gateway cards.
In the IP Telecommuter system, each Meridian 1 system may have multiple
H.323 zones. Each customer within a Meridian 1 system can also be
partitioned into different zones.
The IP Telecommuter Client is the H.323 desktop application that is used in
the IP Telecommuter product. See the IP Telecommuter Client section for
detailed information.
Discovery and registration
A Gatekeeper Discovery and Registration process occurs, where the IP
Telecommuter Clients and the IP Line Gateway cards must register with the
designated IP Line Gatekeeper card. Registration provides a means to map
DNs to IP addresses between IP Telecommuter clients and Gateways
dynamically (instead of statically via a configuration file).
Registration allows the Gatekeeper to authenticate Clients and Gateways to
provide security (i.e., that those accessing the network are who they claim to
be). An encrypted block provides the authentication used in registration and
admission messages. Each client and the gatekeeper separately know the
password used in the key encryption.
During the Client registration process, the Gatekeeper obtains the DN,
password, and the associated IP address from the registering IP client,
authenticates the client, and populates the client address translation database
with entries of these active IP clients.
During IP Line Gateway card registration, the IP Line Gatekeeper card
obtains the lists of DNs and the Gateway IP address from the registering IP
Line Gateway card. Similarly, the Gatekeeper populates the active Gateway
entries with its IP address and the list of DNs it serves in the Gateway address
table.
These address translation databases are then used by the Gatekeeper to
perform address translation whenever a call is made from the Meridian 1 to
an IP client, from an IP client to the Meridian 1, or from an IP client to an IP
client.
ITG Line 1.0/IP Telecommuter Description, Installation and Operation