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The term “PBX” stands for Private Branch Exchange. A PBX is simply a business phone system.
The NEC Pbx system solutions are hybrid, which means they offer the latest IP technology as well as traditional technology. This caters for customers seeking cheap VoIP phone calls, IP networking between sites and even remote users as well as companies that want to keep traditional phone lines (ISDN, PSTN, PRI)
Bring people together anytime, anywhere, and on any device with Cisco's integrated collaboration infrastructure for voice and video calling, messaging, and mobility. Cisco Unified Communications Manager (Unified CM) provides reliable, secure, scalable, and manageable call control and session management.
Asterisk is a software implementation of a private branch exchange (PBX). In conjunction with suitable telephony hardware interfaces and network applications, Asterisk is used to establish and control telephone calls between telecommunication endpoints, such as customary telephone sets, destinations on the public switched telephone network (PSTN), and devices or services on voice over Internet Protocol (VoIP) networks.