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PortaOne is a leading global vendor of carrier grade software for Internet Telephony Service Providers (ITSP). We enable ITSPs to run a broad line of telecommunication services with a single software package. Our clients can make money on traffic exchange and wholesale trunking, hosted IP PBX or Centrex for business customers, residential telephony services with Vonage-like or Skype-like features, prepaid calling cards and call shop chains, callback services, and much more.