My billing system will work on open source FusionPBX which is running by Freeswitch. You will get completely class 5 VOIP and PBX billing system where you can track A-Z customer management.
I will voip billing, asterisk billing, voip server, calling card solution for $50
I will install or configure a2billing mobile voip for $25
I will build, and troubleshoot your Linux systems and applications for $25
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