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1. Safety Instructions
1. Do not attempt to service the product yourself. Any servicing of this product should be referred
to qualified service personnel.
2. To avoid electric shock, do not put your finger, pin, wire, or any other metal objects into vents
and gaps.
3. To avoid accidental fire or electric shock, do not twist power cord or place it under heavy objects.
4. The product should be connected to a power supply of the type described in the operating
instructions or as marked on the product.
5. To avoid hazard to children, dispose of the product's plastic packaging carefully.
6. The phone line should always be connected to the LINE connector. It should not be connected
to the PHONE connector as it may cause damage to the product.
7. Please read all the instructions before using this product.
2. Preface
The VG3300 unit is a personal SIP VoIP gateway developed using the latest in VoIP technology. It is
also very simple to install and easy to operate.
2.1.
What is SIP
Session Initiation Protocol (SIP) is the Internet Engineering Task Force's (IETF's) standard for
multimedia conferencing over IP. SIP is an ASCII-based, application-layer control protocol (defined
in RFC 2543& RFC 3261) that can be used to establish, maintain, and terminate calls between two
or more end points. Like other VoIP protocols, SIP is designed to address the functions of signaling
and session management within a packet telephony network. Signaling allows call information to be
carried across network boundaries. Session management provides the ability to control the
attributes of an end-to-end call.
SIP provides the following capabilities:
Determine the location of the target end point—Supports address resolution, name mapping, and
call redirection.
Determine the media capabilities of the target end point—By using Session Description Protocol
(SDP), SIP determines the highest level of common services between the end points. Conferences
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VG3300
series user guide
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