E1/T1
A European format for digital transmission. E1 supports signals at 2 Mbps (32 channels at 64Kbps, with 2 channels reserved for signaling and controlling), versus the T1, which carries signals at 1.544 Mbps (24 channels at 64Kbps).
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Voice of IP of VoIP technology, is the one which completely changed the telecommunications market by transmitting voice over the Internet. During past several years it expanded in such a way that right now it covers each and every corner of the world and it became the new standard of telecommunication. Nowadays there are plenty of companies offering different kinds of services and devices.
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