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[part 02] PBX and PSTN introduction to basic VoIP concepts
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The first thing to understand here are what a PBX and what PSTN are. PSTN, to oversimplify it, is the outside world. We talk to the PSTN when we call the pizzeria from our cellphone. A PBX is what our office phones communicate with before they talk to the PSTN.
For information on having us set up your phone system, check out our website: this is something we can do for you!
http://www.rossmanngroup.com/business-phone-system-solutions/
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