IPsky United States
- International VoIP Wholesale Provider
- Phone To Phone
- Quintum
- Billing system of own development
SIP protocol was made within IETF (Internet Engineering Task Force) – organization occupied with establishing Internet standards and general standards concerning TCP/IP protocols.
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The service that most owners look for is VoIP or voice over internet protocol. This service allows the user to make long distance calls using the standard internet connection
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