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Packet-switched telephony

  • US 10,027,511 B2
  • Filed: 05/16/2017
  • Issued: 07/17/2018
  • Est. Priority Date: 05/31/2001
  • Status: Expired due to Term
First Claim
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1. A method comprising:

  • receiving a call request from a user device at a packet switched telephony service provider (PTSP), the call request including a telephone number corresponding to a public-switched telephone network (PSTN) subscriber;

    transmitting the call request from the PTSP to a gateway for forwarding to the PSTN subscriber; and

    causing a call to be established between the user device and the PSTN subscriber, the call including media data and call control data, the media data including at least one packet with a network address corresponding to the gateway, the call control data included in at least an additional packet with an additional network address corresponding to the PTSP, the call control data including call ping data sent while the call is in progress, the ping data comprising one or more signal strength indicators.

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