Specifications

TD 92326GB
2009-03-10 / Ver. E
Installation and Operation Manual
VoIP Gateway
130
18.3 Operate Several PBX Applications in Combination
Several PBX Applications used at different locations can be connected and operated in
combination. This makes the administration considerably easier and clearer and it allows
the connections between the different locations to be switched inexpensively via the IP
connections.
Figure 119. Several PBX Applications in combination
The location concept of the PBX Application includes a master PBX Application in each
configuration. Each subscriber is aware of its location there.
New subscribers can be administered centrally via the master PBX Application. The
subscriber is set up at the respective local PBX Application solely by the entry in the PBX
field.
If a subscriber is called from a location at which the subscriber is not configured, the local
PBX Application forwards the call to the master PBX Application. The call is forwarded
there either to a subscriber of the master PBX Application or to a further location.
In addition, the master PBX Application backs up the respective local PBX Application. If a
local PBX Application happens to fail, but the IP connection to the master PBX Application
is retained, the master PBX Application can immediately take over the work of the local
PBX.
The different PBX locations still operate absolutely autonomously however and remain
operational if the IP connection between them happens to fail. In this case the calls are
forwarded via the local exchange access line.
VoIP Gateway 2
VoIP Gateway 3
LAN
Slave PBX Application
Slave PBX Application
VoIP Gateway 1
Master PBX Application
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