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ASTPP is recognized as the leading open-source VoIP Billing Solution that operates on the FreeSWITCH platform. It has earned a reputation as the premier smart telephony platform, offering a diverse array of VoIP solutions. Among its impressive offerings are Class 4 Softswitch, Class 5 Softswitch, Calling Card platform, Multi-Tenant IP PBX system, VoIP Billing Solution, Mobile SIP dialer, PC dialer, and more