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V400 Series VoIP Gateway User Guide
YML832 Rev1
1. Introduction
Product Overview
The NetComm V400 series stand-alone VoIP Gateways carry both voice and facsimile over an IP network.
They support the SIP industry standard call control protocol to be compatible with free registration
services or VoIP service providers’ systems and they work in two different modes: UA (User Agent) or
Server. As a standard user agent, the gateways are compatible with all well-known Soft Switches and SIP
proxy servers. With optional server software, the gateways can also be configured to establish a private
VoIP network over the Internet without a 3
rd
party SIP Proxy Server.
Each of the V400 series VoIP gateways have of four voice ports and four ethernet ports. The voice
ports can have different combination of FXS and FXO ports; FXS ports are used to connect directly to
a telephone set and FXO ports are used to connect directly to PSTN lines. As a result there are four
models available: V431 (3 FXS ports + 1 FXO port), V422 (2 FXS ports + 2 FXO ports), V440 (4 FXS
ports) and V404 (4 FXO ports). The gateways can be seamlessly integrated into existing networks by
connecting to a phone set, PBX, key telephone system, fax machine or PSTN line. With only a broadband
connection such as an ADSL bridge/router, Cable Modem or leased line router, the gateways allow you to
gain access to voice and fax services over an IP network thereby reducing the cost of international and
long distance calls.
In addition, each gateway includes an in-built 4 port Ethernet switch which supports comprehensive
Internet gateway functions to accommodate other PCs or IP devices to share the same broadband
stream. The QoS function allows voice and data traffic to flow through at the highest priority. and with
TOS/DiffServ bit enabled, it guarantees that voice packets will have the first priority to pass through a
TOS/DiffServ enabled router.
With the support of DDNS, the gateways are reachable by a domain name where the IP address is
dynamically assigned by the ISP, thereby allowing users to host a web site or mail server in a PPPoE or
DHCP network.
Each gateway can be assigned with a fixed IP address or by DHCP, PPPoE, adopting the G.711, G.726,
G.729A or G.723.1 voice compression format to save the network bandwidth while providing real-time
and toll quality voice. In addition, in the event that the power supply fails or the Internet connection is
lost, each gateway can divert the FXS lines to the PSTN network on the FXO ports so that users can still
use their conventional PSTN line to make calls.
IMPORTANT SAFETY INSTRUCTIONS
• When using your telephone equipment, basic safety precautions should always be followed
to reduce the risk of fire, electric shock and injury to persons, including the following:
• Do not use this product near water for example, near a bathtub, washbowl, and kitchen
sink or laundry tub, in a wet basement or near a swimming pool.
• Avoid using a telephone (other than a cordless type) during an electrical storm. There
may be a remote risk of electric shock from lightning.
• Do not use the telephone to report a gas leak in the vicinity of the leak.
• Use only the power cord indicated in this manual.
