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Most importantly, business that manage calls over the IP PBX VoIP solution provide comfortable integration with existing PSTN telecommunication system.
Related : VoIP Phone System - Small Business PBX - VoIP PBX - Phone Lines - VoIP IP Telephony Hosted PBX.
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It uses VOIP technology—in other words, your phone service is delivered over the internet.
Hosted VoIP services are available for small to medium companies that don't want their own PBX.