VoxiPlus
Advanced
INSTALLATION MANUAL
© 2008 TOPEX S.A.
page
11
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PBX to GSM or PSTN routing
The Advanced VOXI 2U equipment may be connected to a digital PBX via E1 digital trunks. But
you may connect it also to an analog PBX, using either FXS or FXO links, if it is equipped with MPAI
telephony cards. Now the calls from the local subscribers of the PBX may be routed for minimum
costs either the corresponding mobile caller, to the PSTN oar to VoIP.
Figure 3 – VoIP Call routing to IP or Mobile
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VoIP to GSM routing
An incoming call from the IP network (VoIP call using SIP or H323 protocol) is analyzed by the
Least Cost Router (LCR). The LCR decides which line the call shall use for going out. The decision
depends on the called number and LCR settings.
Figure 4 – Least Cost Routing
The Least Cost Router is designed primarily for searching the most cost-efficient route to a
GSM network, it is not limited just to this function.
Generally, it can interconnect incoming calls from VoIP lines to any lines that are available in
the gateway regardless of their types. This is very useful for interconnecting heterogeneous VoIP
networks, such as SIP and H.323 environments.
