All you need to Know about PABX, IP-PBX, and PCI DSS Compliance

PABX or Private Automatic Branch eXchange is an automatic telephone switching system used within a private enterprise. The technology allows an organization to create its own in-house phone network. By doing so, dialing, calling, and re-routing calls to different extensions within the organization become easy. The predecessor to Private Automatic Branch Exchange was known as PBX, which stands for Private Branch eXchange. These systems required a live operator. Several private automatic branch exchange manufactures distinguish their products by creating distinct types of private branch exchanges. For instance, CABX (Computerized Branch Exchange) and EPABX (Electronic Private Automatic Branch Exchange) are two distinct PABX systems. Most environments leverage private automatic branch exchange follow the PCI DSS Compliance.


Traditionally, PBX devices have been hard-wired. However, several businesses had switched to IP-PBX. The upgraded version of PABX system makes use of VoIP technology for sending calls over the Internet and hence, making the PBX system virtual. A virtual private automatic branch exchange system leveraging a computer system offers advanced features, as well as a platform that is highly and easily customizable.


With IP-PBX technology, phone extensions are possible to create wherever there is an availability of Internet connection. Unlike traditional hard-wired phones, IP-PBX systems can be extended easily and without much expense and efforts. Obviously, virtual PABX systems cost much less than traditional private automatic branch exchange setups.

Private Automatic Branch Exchange Operation

Whether a business makes use of the traditional Private Automatic Branch eXchange system or an IP-PBX setup, the basic operation remains the same. The process starts as soon as an incoming call arrives. It is then routed to the central control station. Each incoming call is then assigned a code. As a PABX system is equipped with several lines, it is capable of handling and sorting several incoming calls simultaneously.


The private automatic branch exchange system is programmed with extension numbers corresponding to each phone that is used within the office premises. Based on the unique number assignment system, the device is capable of transferring incoming calls to any of the lines. Typically, a call operator answers to all incoming calls with pleasantries. Nonetheless, it is also possible to put a recorded greeting message in place for holding so many calls. As soon as the caller tells about the desired extension, the system switches and connects the dialer to the desired terminal. Thereafter, it stands by for the next incoming call.

PCI DSS Compliance

The concept of Payment Card Industry Data Security Standard or PCI DSS Compliance is related to calls involving sensitive credit card information. It involves specific knowledge, as well as practices. In fact, there is no substitute for apt legal and operational guidance from seasoned PCI-DSS experts. Full details about the PCI-DSS Compliance are available on the official website of the PCI Security Standards Council. Moreover, the website describes how different types of businesses can become PCI DSS compliant. Businesses need to regularly visit the official website, as latest amendments and changes to the compliance are available there.

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