Products:

IP Based EPABX & Digital Key Telephone System

• A business telephone system is a multiline telephone system typically used in business environments, encompassing systems ranging from small key telephone systems to large-scale Hybrid IP- private branch exchanges. A private branch exchange (PBX) is a telephone exchange or switching system that serves a private organization and performs concentration of central office lines or trunks and provides intercommunication between a large number of telephone stations in the organization or group of organizations. The intercommunication aspect allows two or more stations to establish telephone or conferencing calls between them without using the central office equipment. Each PBX-connected station, such as a telephone set, a fax machine, or a computer modem, is often referred to as an extension and has a designated extension telephone number that may or may not be mapped automatically to the numbering plan of the central office and the telephone number block allocated to the PBX.A PBX is differentiated from a key telephone system (KTS) in that users of a key system manually select their own outgoing lines on special telephone sets that control buttons for this purpose, while PBXs select the outgoing line automatically or, formerly, by an operator. The telephone sets connected to a PBX do not normally have special keys for central office line control, but it is not uncommon for key systems to be connected to a PBX to extend its services. A PBX, in contrast to a key system, employs an organizational numbering plan for its stations. In addition, a dial plan determines whether additional digit sequences must be prefixed when dialing to obtain access to a central office trunk. Modern number analysis systems permit users to dial internal and external telephone numbers without special codes to distinguish the intended destination.
  
  But the trend is now changing with the advent of Internet telephony (Voice over IP) technologies; PBX development has tended toward the IP PBX, which uses the Internet Protocol to carry calls. An IP PBX is a PBX with Internet Protocol connectivity and may provide additional audio, video, or instant messaging communication utilizing the TCP/IP protocol stack. VoIP gateways can be combined with traditional PBX functionality to allow businesses to use their managed intranet to help reduce long distance expenses and take advantage of the benefits of a single network for voice and data (converged network). An IP PBX may also provide CTI features most modern PBXs support VoIP. ISDN PBX systems also replaced some traditional PBXs as ISDN offers features such as conference calling, call forwarding, and programmable caller ID. As of today ISDN is being phased out by most major telecommunication carriers throughout Europe in favor of all-IP networks, with some expecting complete migration in coming years down the line originally having started as an organization's manual switchboard or attendant. Console operated by a telephone operator or just simply the operator for an organization in different branches of the same office, the concept is now changing to keep a centralized universal operator to serve the all branches. Even though VoIP is considered the future of telephony, the circuit switched network is still the core of communications, and the existing PBX systems are competitive in services with modern IP systems.