Specifications
TD 92326GB
2009-03-10 / Ver. E
Installation and Operation Manual
VoIP Gateway
145
21.2 Maps
Of course, call switching often also depends on the call numbers dialled. That is why it is
necessary to define the validity of routes for calls with certain destination numbers. This is
done by attaching a so called Map entry to the route of each valid dial prefix. Each Map
entry therefore determines that calls from the source interfaces specified in the route with
the combination of digits specified in the map, can be connected to the destination
interface defined in the route, figure 126 shows such a scenario.
Figure 126. Call number dependent routes
Sometimes it is useful to modify the called number in the course of call switching. After
all, it is sometimes necessary to define routes that depend on the calling number. To do
this so called CGPN Maps are attached to the Maps, very much in the same way as the
Maps are attached to the routes. This not only allows the calling numbers to be modified
in order, for example, to suppress the extension for outgoing calls, but also the entire Map
to be made dependent on the calling number.
Call switching is controlled by the VoIP Gateway's routing table (in the “Routes” area).
Figure 127. Routing table
The routing table is searched through from top down for every single call. If a Map is
found;
• whose route has specified the source interface of the current call as a permitted
interface in the list and whose dial prefix specified in the “Called number in” field
matches the called number of the current call, and whose “Verify CGPN” box is not
selected
or
• whose “Verify CGPN” check box is selected and the calling number of the current call
matches the “Calling number in” entry, “CGPN maps” attached to “Map”
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Call switching
Route 1: VoIP 1/2 >> PRI
Route 2: VoIP 1 << PRI:20
Route 3: VoIP 2 << PRI:30
ISDN
PRI
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VoIP client 1
VoIP client 2