8.4 SIP Trunks
This section provides information on using SIP trunks with the PBX.
8.4.1 IP Telephony Service
The
Virtual
SIP Trunk Card (V-SIPGW) is a virtual trunk card which is designed to be easily integrated into an
Internet Telephony Service provided by an ITSP (Internet Telephony Service Provider).
As a major SIP Provider, an ITSP provides its telephony service partly through the conventional telephone
network (e.g., ISDN and Mobile), which is fee-based. An ISP (Internet Service Provider), another major SIP
Provider, does not provide telephone connection itself. However, providing its users with Internet access, an
ISP provides voice communication on the Internet for free. In this way, with VoIP technology based on the SIP
protocol, the cost of voice communication can be much cheaper than conventional telephone networks. A
maximum of 4 V-SIPGW16 cards can be installed to the virtual slots of the PBX. The channel capacity of the
card allows users to connect to up to 32 different ISP/ITSPs.
V-SIPGW Connection Outline
The following diagram illustrates a simple VoIP network connecting the V-SIPGW card to the Internet.
PBX with
V-SIPGW Card
PC
LAN
(Local Area Network)
WAN (Wide Area Network)
Internet
Local
Telephone
IP-PT
ISP
ITSP
Router
Switching
Hub
Requirements for Internet Telephony Service
• You need to subscribe with an ISP for Internet connection.
322 Installation Manual
8.4.1 IP Telephony Service
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