2N VoiceBlue Enterprise - User Manual - Manual (Page 67)

Insight into VoIP Gateway 5-5
5.2. Lines
Call interconnecting and routing in 2N VoiceBlue Enterprise takes
place between lines. This means that where no line is available the
gateway cannot connect a call. Nevertheless, the notion "line" is
less materialistic in VoIP gateways than in classical telephone
systems.
There are always lines corresponding to the GSM modules
available in the gateway at least. To make the equipment work as a
gateway, another line at least has to be created to the VoIP
environment. This line is either used for gateway - VoIP PBX
connection or 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 types of lines are equal for routing and connecting
purposes. Routing rules can be defined for VoIP lines mutually as
for VoIP - GSM lines. This can be useful when more VoIP
networks need to be interconnected, e.g. SIP and H.323.
GSM and SIM
We mentioned that a line corresponds to each GSM module. These
lines are called "GSM module – 1" to "GSM module 4"
1
and
correspond to respective SIM card drawers. If we define that all
incoming calls should go via the "GSM module – 1" line, then the
gateway shall always connect calls through the SIM card located
in the first drawer.
If you operate the gateway with different providers' SIM cards,
you will definitely want to use the GSM provider's SIM card for
GSM call routing. In that case, however, avoid any misplacement
of SIM cards after having configured the routing rule.
1 If you have purchased a two-channel gateway, then only the "GSM module - 1“ and "GSM module
- 2“ lines will be available.