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Method and apparatus for communications between carriers

  • US 10,264,132 B2
  • Filed: 08/01/2016
  • Issued: 04/16/2019
  • Est. Priority Date: 08/01/2016
  • Status: Active Grant
First Claim
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1. A call session control function server, comprising:

  • a processing system including a processor; and

    a memory that stores executable instructions that, when executed by the processing system, perform operations, the operations comprising;

    receiving a request originated by a first device of a first carrier network managed by a first service provider entity to initiate an internet protocol call session with a second device;

    comparing a called number included in the request against a first calling range associated with the first carrier network and a second calling range associated with a second carrier network managed by a second service provider entity;

    determining, according to the comparing, that the second device is associated with the first carrier network when the called number is within the first calling range and is associated with the second carrier network when the called number is within the second calling range; and

    responsive to determining that the second device is associated with the second carrier network;

    performing a first query to an internetwork packet exchange telephone number mapping equipment server (ENUM) of a third network to obtain a first pointer to a second carrier network telephone number mapping equipment server (ENUM) according to the request;

    receiving the first pointer to the second carrier network telephone number mapping equipment server according to the first query;

    performing a second query to the second carrier network telephone number mapping equipment server to obtain a record associated with the called number of the second device according to the first pointer;

    receiving the record associated with the called number of the second device from the second carrier network telephone number mapping equipment server according to the second query;

    determining a first internet protocol address for the second device from the record associated with the called number; and

    transmitting the first internet protocol address for the second device to a session border controller of the first carrier network to initiate the internet protocol call session between the first device of the first carrier network and the second device of the second carrier network.

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