4 Chapter 1 Understanding Your IP1200C
Overview
In the past, real-time voice communication can only be done on the PSTN. With the circuit switched technology,
every call takes up a dedicated bandwidth. End-to-end calls are established on the basis of a sequence of digits,
and the PSTN dedicates a physical path between callers. The telephone equipment establishes the call path at the
beginning of a call and occupies the dedicated path till the end of the call.
Compared to the PSTN, an Internet Protocol (IP) network has a packet-switched architecture. Data is transmitted
in packets, and the path from end to end can vary within an established session. The data packets also contain the
destination IP address information, with which packets are routed. As networking environments change, routing
devices are updated with dynamic protocols.
IP1200C is a high performance embedded VoIP Gateway that transmits voice over packet switched networks and
route it to circuit switched networks.
All-in-one Design
IP1200C contains its own processor, memory, and network interface; it works independently and intelligently!
Simply connect it to your IP network and PSTN or phone sets, and then you are ready to talk via the Internet. All
of the communication costs will be eliminated except the local networks connection charge. IP1200C is the most
convenient embedded VoIP gateway for users to make Internet phone calls without the hassle of changing the
existing infrastructure.
Device-to-Phone Operation Mode
IP1200C is a reliable bridge between two different locations. The FXO/FXS telephone interface provides the
system with an ultra flexible PSTN connection. Supported by DSG Global Internet Telephony Network, users can
make phone calls to any regular phone numbers in the world.
Figure 1: Device-to-Phone Mode Diagram
Terminology
In this manual, there are some terminologies you might not be acquainted with. The following is a list of
commonly used voice technology terms.
Terms Definitions
C.O. Line
Central Office Line
DTMF
Dual Tone Multi Frequency. Dialing signals transmitted as two simultaneous voice
band tones.
IP Internet
Protocol
LAN
Local Area Network
FXO
Foreign Exchange Office. A FXO interface connects to PSTN.
FXS
Foreign Exchange Station. A FXS interface connects to the standard telephone, fax
machine, modem and conventional PBX.
ITSP
Internet Telephony Service Provider
Summary of Contents for IP1200C
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