One of the main characteristics and advantages of a PBX in reducing the number of subscriber lines from the main switch PSTN. Other key features include PBX maintain routing information for telephone lines and calls the client path consequently.
PBX systems have one key distinction functions to manually select the starting lines, while PBX systems automatically dial the outgoing line. As its name already outlined PBX is used mainly as a private device own by companies. PABX systems and equipments is regarded and placed at the customer’s premise rather than the company positioned the phone.
The purposes of the PBX have been developed since its first appearance. Initially, the main advantage is to have cost savings on internal phone calls. By handling the circuit switching locally, it further reduced charges for local telephone service. As PBXs gained wider acceptance and popularity, PABX began to offer services that are not available in the transmission system operator network. Services like: group hunting, call forwarding and call an extension. One of the many reasons for the persistence of the PBX is its ability to adapt to both emerging markets and changing consumer needs. PABX has come through adaptations since its manual installations in 1896 until the date of analogue systems of the 1970s. PBX will continue to have an evolving technology, partnering with the new integrated VoIP technology.
PBX telephone system has changed four stages of evolution. The first step was introduced in 1896, when the manual telephone exchange PBX was introduced and installed. The second phase called proportional analogue phase. PBX technology offers analog signal for communication between end user systems and PBX trunks. The third step came in 1976 when it introduced digital signals, as the last method of communication. The digital platform has been accompanied by improvements such as enhanced PBX functionality and improving overall system performance. The current and fourth stage is still in development, entered the scene in 1999 when the telecommunications system began with the IP (Internet Protocol) as a way for signaling communication methods.
It is crucial to note that the three techniques described in the preceding paragraph are still being used for many years until today and will be used thereafter. There are significant differences between analogue and digital technologies. While analog technology is comparatively simple and inexpensive, but compare to the digital technology, it is lacking some of the advanced features.
Digital signalling takes video or voice and converts it into binary format of 0s and 1s. Binary format takes less line resource than electronic impulses in analogue signalling. By using this increased complexity of signalling in digital lines, more functions can be passed down to end-users from the PBX system.
The third and last of evolution PBX, it is more popular in term of VoIP. IP-PBX can integrated into WAN / LAN networks to communicate with IP-enabled devices worldwide. At the latest trends in PBX development is the VoIP PBX, also known as IP-PBX or IP PBX, where Internet Protocol is being used to make calls. In this latest technology, our phone systems are no longer linked to bandwidth limitations of traditional connectivity PBX. IP-PBX systems offer a truly on demand, remote operation at work when the phone is connected to your devices’ IP addresses dynamically change the world.
Numerous new business and open platform PBX systems with the new IP based technologies have been developed. This IP-enabled phone system is called Asterisk technology, based on IP VoIP platform, and introduced to the community for free. However, recent open source projects related to affordable modern equipment will significantly reduce the cost of ownership system PBX.
Asterisk PBX is software running a PBX system that is freely accessible to all under the GNU General Public License (GPL). Asterisk can be installed for a variety of operating system (OS), platforms such as Linux, BSD and Mac OS X. Some devices include the Asterisk conference calling, call forwarding, call forwarding, caller ID, calling cards, caller - ID blocking, E911, IVR, music on hold, voicemail and more. It supports standard codecs such as ADPCM, G.711, G.723, G.726, G.729, GSM, Speex, and others. Supported protocols are IAX, H.323, SIP, and MGCP SCCP. Your support for the interoperability of traditional telephony include E & M, FXS, FXO, LoopStart, Ground Start, DTMF, and more.
