8.3.1 IP Telephony Service
WAN
STUN
STUN
STUN
Server
Server
Server
ISP/ITSP
ISP/ITSP
ISP/ITSP
LAN
Note
•
If an ISP/ITSP uses a device such as SBC (Session Border Controller), you may not have to enable
the NAT Traversal feature.
•
A STUN Server is supplied by an ISP/ITSP, and not included with the PBX.
354
Installation Manual
Internet
STUN
STUN
STUN
SIP
SIP
SIP
Server
Server
Server
PC
PBX with
V-SIPGW16 Card
Fixed IP Address
Fixed IP Address
Fixed IP Address
SIP
SIP
SIP
Server
Server
Server
ISP/ITSP
ISP/ITSP
ISP/ITSP
Router
(NAT enabled)
Switching
Hub
IP-PT