These are more and more companies are deploying open-source IP-PBXs now, like Asterisk or FreeSwitch based on IP PBX phone systems, and other SIP-based communications servers in their networks. Developers and resellers of such systems need to be able to complement the central IP-PBX with other network elements that will provide their customers with a full solution.Read more: Open-Source IP PBX Applications
Real Tone Technologies RT series All in one IP PBX based on embedded design with IP PBX software inside, support up to 96 analog extensions and CO PSTN lines, only one unit will provide complete IP PBX phone systems for small and large-size office, RT Series IP PBX support local or remote SIP extensions, and can be working under NAT for remote SIP extensions, it is really full-featured IP PBX phone systems with low costRead more: All-In-One IP PBX
VoIP based on Call center applications
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calling card service
4 to 96 FXO PSTN ports VoIP Gateways for call terminations
IMS badsed on Residential telephone service solutions for telecom carrier
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