When legacy PBX systems were the norm, users had to pay for proprietary operating systems that used proprietary hardware and software. The upshot of legacy PBXs has always been the reliability and availability. The advent of VoIP was greeted with skepticism regarding the ability of IP telephony to provide reliability on par with legacy systems. networkworld.com reports:
Network managers immediately need to understand the critical elements that comprise modular open PBX systems and begin understanding the finer points of each.
Read More: VoIP: more survivable than legacy PBX
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