
15
IP PBX Basics
…
Internet
ISP/ITSP
PSTN/GSM
SIP Trunk
PSTN/GSM
PSTN Trunk
LAN Switch
PSTN Trunk (FXO): Company needs a
representative PSTN number for customers
to call. If the direct calling with PSTN
number to VoIP network is not supported by
ITSP, FXO ports connect with PSTN and
receive daily phone calls from PSTN/GSM.
The IP-based communication platform is
operated over the LAN wiring infrastructure
that is constructed via LAN switch.
SIP Trunk: IP PBX supports SIP trunk to
register with SIP Proxy of ISP/ITSP that
provides cost-saving call routes.
PC with
Soft-phone
IP Phone
FXS
Gateway
IP PBX
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