Devices – 2N OfficeRoute - User manual, 1493 v1.9.0 User Manual
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Incoming Calls from GSM
A special routing mechanism is applied to calls coming to the 2N OfficeRoute/2N
®
®
gateway from GSM networks.
VoiceBlue Enterprise
Figure 3.37: Routing of Incoming Calls from GSM
As selected, the GSM router:
forwards the call to a fixed operator;
plays ME message and allow to dial local or remote number according to the ME
CLIP; or
forwards the call to the DISA automat where the calling party chooses the route
using a voice menu and tone dialling.
Since incoming calls from GSM networks can only be routed to VoIP lines in the
gateway it is impossible to connect a call back to the GSM network in this type of
routing. This, however, does not mean that this operation cannot be executed on
another routing level, e.g. in a PBX.
If the VoIP telephones used are equipped with the Calling Line Identification
Presentation (CLIP) function, either the internal number of the gateway output line
used for the incoming GSM call, or the CLIP obtained from the GSM network can be
displayed. This VoIP line parameter is set at the first option by default. To make the
gateway convey a public number to the VoIP telephone it is necessary to ensure that
all routing elements be able to process the CLIP correctly in the opposite direction.
Devices
Call interconnecting and routing in
tak
2N OfficeRoute/2N VoiceBlue Enterprise
®
®
es place between lines. This means that where no line is available the gateway cannot
set up a call. Nevertheless, the notion 'line' is less materialistic in VoIP gateways than
in classical telephone systems.
To make some equipment work as a gateway, another line at least has to be created to
the VoIP environment. This line is either used for the gateway - VoIP PBX connection or
a direct gateway - VoIP telephone connection. From the viewpoint of the network
environment of the gateway, a VoIP line represents a virtual VoIP telephone set.
It is possible to define more VoIP lines than one in the gateway. Then the gateway
appears like a system of multiple virtual VoIP telephones. All line types are equal for
the routing and connecting purposes.