VoxiPlus
Advanced
INSTALLATION MANUAL
© 2008 TOPEX S.A.
page
12
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GSM to VoIP routing
Since incoming calls from GSM networks can only be routed to VoIP lines in the gateway, in
this type of routing it seems impossible to connect a call back to the GSM network. 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 will be able to
process the CLIP correctly in the opposite direction.
