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X6004 User’s Guide
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CHAPTER 1
Getting to Know Your X6004
This chapter introduces the main features and applications of the X6004.
1.1 Introduction
An IP PBX is a telephone exchange device located at a company site which allows an
organization to set up and control calls. IP stands for Internet Protocol, and PBX stands for
Private Branch Exchange. A regular company telephone switchboard is an example of a PBX.
The company’s telephones are connected to the IP PBX. The IP PBX is then connected to the
outside world via a connection to a traditional Public Switched Telephone Network (PSTN) or
a broadband Internet connection to an Internet Telephony Service Provider (ITSP).
Each telephone connected to an IP PBX has an extension assigned to it. An extension is a
unique telephone number within an organization typically consisting of only a few digits.
People inside the company can call each other by dialing extensions. Calls to the outside world
go through the IP PBX to the PSTN or ITSP.
Figure 1 IP PBX Example
The X6004 can function as a stand alone telephone switchboard for a small organization. It
can also supplement a legacy PBX within an organization by providing VoIP telephony
features.
PSTN
Internet
ITSP