VoIP Provider

General PBX Info

PABX (Private Automated Branch Exchange) is an automatic telephone switching system used by organisations.

It connects the internal phone extension to the PSTN through trunk lines. Telephone, fax machine and modem can be incorporated in the PABX system. This system come in different sizes and can be placed at the subscriber’s site.

The first generation of PABX starts with manual switchboard. From switchboard, it slowly switches to analog version and then to digital version. The latest PABX is known as IP PBX. IP PBX deploys IP phones by connecting to the companies’ data network. IP PBX is able to make outgoing call via data network to another destination and this is known as VoIP calls.

Some of the common features of PABX include Automatic Call Distributor and Interactive Voice Response (IVR). The Interactive Voice Response will process and manage incoming calls and then direct the calls to designated extension. Other capabilities of PABX include outbound dialling protocols which supports autodialing, progressive dialling and predictive dialling.

With PABX system, communications between departments and branches are easy and cost saving compared to having external phone lines connected to every phone in the organisation.

They are different from the key system as for key systems users will select the outgoing lines manually. As for PABX system the phone system will do this automatically.

PABX system is affordable. Companies need only pay a low monthly fee to enjoy this PABX system. The system used to be very expensive back in the days and requires on-site physical equipment and high maintenance. With affordable PABX system nowadays, small companies remain competitive business world as they can enjoy what the huge companies enjoys in communication part, as they don’t require huge investment to use PABX anymore.

Modern PABX, which is the IP PBX, offers more advanced features at lower cost to its users compared to its digital version. The main reason is their better integration with the data communication that improves the business operation and flow.

Although more companies are using PABX system in their company communications, some features such as the Interactive Voice Response (IVR) are sometimes being criticised. Some if this criticism includes that the IVR is not efficient enough as it fails to meet the caller’s need and results in some companies prefer human response rather than the IVR features. Companies will need to see what PABX features that is suitable for their companies and what features are not when it comes to choosing a suitable PABX system.

Companies can maximise the security of their PABX system by changing all default password and pin. Besides this, avoid using weak pass code, and change the password on regular basis.

The IP-PBX system begins by transmit calls over the Internet. Data are transferred in data packet over the network. When the data are received at the recipient’s site, it will be translated into traditional calling format which are then connected through standard phone lines. IP-PBX system come with standard telephone feature, where additional features can be added when needed as the organisation grows.


A basic IP-PBX system will include an IP-PBX server, SIP or VoIP phones and a VoIP gateway. The IP-PBX server has a similar function of a proxy server. The SIP or VoIP phones can be hardware phone or soft phones. A softphone is software that allows user to talk through VoIP and has interface which allow user to dial numbers on the screen.


The most important part of the system is the IP-PBX server. VoIP clients will register SIP addresses with the IP-PBX server using Session Initiation Protocol (SIP) system. This system maintains a database of the clients and their addresses.


When user makes a call, the server will determine whether it’s an internal or external call. Internal calls will directed to the SIP address of the phone while external calls will be directed to VoIP gateway. The organisation may use its own VoIP gateway or use their service provider’s gateway to link IP system with the PSTN. The VoIP gateway then connects to either analogue or digital lines.

IP-PBX is a complete telephony solution that sends and receives calls through data network using Internet. Organisations are not required to interrupt and change their existing communication infrastructure to use IPPBX.


IP-PBX is an electronic switchboard that receives and manages the calls such as routing, holding and forwarding calls that arrives over the Internet. User of IP-PBX can have the choice to have a fully automated attendant or a human receptionist to route incoming calls to internal IP numbers and extensions. IPPBX is entirely digital software based. The hardware purpose is to merely run the program and to transmit the data. IP-PBX is easy to maintain. In a hosted IP-PBX, the maintenances are handled by the provider of the IP-PBX system.


Since it doesn’t require a huge investment to install IP-PBX, it allows and aids small and medium enterprise to run more effectively with this complete system.


IP-PBX also provides a flexible and scalable solution. The upgrading of the solution such as adding of user, lines and extensions are flexible according to the organization’s growth. IP-PBX can connect the user to other end user of the organisation all around the world, and it can handle multiple simultaneous calls.