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[2][4] Vail believed in the superiority of one national telephone system and AT&T adopted the slogan One Policy, One System, Universal Service. [2][5] This became the company's philosophy...
2 IP-PBX 6 See also 7 References 8 External links Key telephone system [edit] A 1930s key telephone for a private branch exchange Key telephone systems are primarily defined by arrangements...
Voice over Internet Protocol ( VoIP ), also called IP telephony , is a method and group of technologies for voice calls for the delivery of voice communication sessions over Internet Protocol (IP) networks, such as the Internet. The broader terms Internet telephony , broadband telephony , ...
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