Installation and Reference Manual
System Architecture
16
Installation and Reference Manual v3.2/0410/6
The system is powered by a centrally replicated but distributed information directory. In essence this
allows components of the system that are on different continents to act and operate in the same way as
components only inches away from the central unit.
All systems access this database using LDAP (the internet standard for accessing databases) for both
reading and writing to the information.
Call Servers are responsible for holding, distributing and replicating this information. All other modules
must have a direct connection via a LAN to a Call Server.
There are two different scenarios that are constructed:
The Call Server that acts as the Primary administration module and holds the master database for the
entire system. This Call Server is responsible for replicating this database to other Secondary Call Servers.
Secondary Mode indicates that this Call Server will receive a replica of the database from the Primary Call
Server. Any local changes are passed back to the Primary for distribution to all other Secondary Call
Servers.
In all of the above cases non-administrative modules, ie Phone and Trunk modules, obtain their
configuration from a local Call Server, thus they do not need to be configured directly. This allows live
deployment of new modules with minimum complexity.
All Trunks and Phones register with the Gatekeeper in the usual H.323 secure methods. The Gatekeeper
is responsible for all Phone Registrations, Call Routing and Call Logging.
1st Floor
2nd Floor
Satellite Site
via standard Web Browser
connected directly to Call
Server, or via LAN, IP WAN,
VPN etc
Ethernet
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