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  • IPKall is a public switched telephone network to voice over IP call forwarding service. Users may register with the service to obtain a phone number chosen from several Washington State area codes and have all calls to that number forwarded to their Session Initiation Protocol or Inter-Asterisk eXchange uniform resource identifier, including an Asterisk server. The telephone company that provides IPKall numbers is International Telcom. IPKall's popularity stems from the fact that it is probably the only remaining, widely accessible US-based VoIP service offering free-of-charge PSTN numbers.

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