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Note
If you connect the SIP-GW4 card to a LAN network and enable the DHCP Client feature, be sure to connect
the card to the same LAN network as the DHCP server so that the card can access the DHCP server
directly, not via a router.
[Diagram 2]
WAN
Data Circuit
Terminating Equipment
(DCE) (e.g., ADSL Modem)
LAN
Switching
Hub
Requirements for Internet Telephony Service
•
You need to subscribe with an ISP (Internet Service Provider) for Internet connection.
•
You need to subscribe with an ITSP for telephone connection. The ISP and ITSP may be part of the same
company.
Note
•
The SIP-GW4 card may not function properly depending on the ITSP being used.
•
The performance of the SIP-GW4 card may deteriorate depending on the network conditions.
•
If you access the Internet from the PC connected to the LAN port of the SIP-GW4 card and send or
receive large amounts of data, there may be an adverse affect on voice communication. In addition,
for security reasons, it is recommended not to access the Internet from the PC connected to the card.
Therefore, it is recommended to connect a PC exclusively for maintenance of the card to the LAN port
of the SIP-GW4 card.
DNS (Domain Name System)
A DNS server normally provides the name resolution service for your computer. As domain names are
alphabetic, they are easier to remember. The Internet, however, is based on IP addresses.
Document Version 2008-10
Internet
ITSP
ISP
PC
(Exclusively for maintenance
of the SIP-GW4 Card)
1.1 Information about IP Telephony Service
Local
Telephone
Extension
Installation Manual
7
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