A private branch exchange (PBX) is the foundation of the business telephony system, enabling employees to communicate productively with those inside and outside the enterprise. An IP PBX is based on IP telephony (IPT), which uses standard packet-switch protocols to carry voice traffic across a data network. IPT brings together a set of convergence technologies that lets PBX vendors combine voice with web, video, and email, and integrate this multimedia platform with business productivity applications. Through IPT, enterprises can achieve a unified collaborative communications network connecting a geographically dispersed community, irrespective of locality and mobility

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