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Public-Switched Telephone Network
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How SIP Trunking Works: IP-PBX vs Hosted VoIP PBX
IP-PBX and hosted PBX systems work in two very different ways from a SIP trunking standpoint. Both technologies interact differently with the Private Branch Exchange (PBX), Public-Switched Telephone Network, Internet Telephony Service Provider, and the Enterprise Boarder Element (EDGE).
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