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Telephone systems (PBXs) are business telephone systems, the provision of telephone services to the telephone network in the company. All calls are made within the company used by these systems that use shared lines for external calls to traditional PSTN (Public Switched Telephone Network) providers managed. The advent of VoIP, the Internet Protocol for voice communication and use of a standard packet switched data network, led to a full convergence of voice and data management in general. The current IP-based system, such as IP-PBX called use the Internet in order to transfer calls using VoIP, while able to use the PSTN to connect to your traditional phone company in any way. An IP-PBX server, for example, works much like other proxy servers on the Internet (in this case, the exchange of voice data).
L ‘(Session Initiation Protocol) SIP standard, used to control multimedia communication sessions over the Internet all other SIP-enabled phone hardware in your network and free enterprise to use in order for a particular provider and its standard be blocked phone. Most VoIP phone systems have a variety of functions, the auto attendant, voice mail, ring groups include, advanced reporting and even video conferencing. An IP PBX can allow, for example, a company that has offices simply connect their network was much cheaper to intra-office calls.
Today there is an increasing trend towards outsourcing of data operations and IP-PBX systems can be hosted by an external provider in the same manner as all other data processing needs.
Modern telecommunications systems, which together with the help of the IP family of standards, significant cost savings in the management, maintenance and total costs associated with the telephone company infrastructure

Regardless of the size of the country and its people is the telecommunications industry also crucial to the country’s financial system and the interests of citizens living there. Earlier in the telecommunications sector in the traditional fixed telephony and cable networks. Currently, mobile telephony, broadband Internet service, packet radio and satellite television systems, additional services that fall under the category of telecommunications.
Technological advances in communications technology, the world is completely connected. People from different regions of the world that does not meet only very slightly, but will also provide information to the other end without the use of cell phones, Internet and GPRS.
The telecommunications sector is divided into two zones. The first use of cable and the other is wireless. with wireless telecommunications technology that is preferred by most people these days due to the simplicity and mobility.
The standard cable and fixed telephony, the cable TV networks, cable and wireless connections for popular models of telecom products. On the other hand, mobile phones, Internet access, including Wi-Fi, General Packet Radio Service the largest case of wireless communication.
In wireless communication, data from the primary source of revenue for the user associated with the radio masts. Mobile phones are devices that people can be seen more quickly reach a wireless telecommunications device to another.