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Support of non-secure warning tones on packet-switched networks, particularly across multiple security domains

  • US 10,122,850 B2
  • Filed: 05/01/2014
  • Issued: 11/06/2018
  • Est. Priority Date: 05/02/2013
  • Status: Active Grant
First Claim
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1. A method for supporting non-secure warning tones on packet-switched networks comprising the steps of:

  • receiving, by a Multi-Level Secure (MLS) voice gateway, a call attempt from a source phone to a destination phone;

    checking, by the MLS voice gateway, if a connection of security domains of the source phone and the destination phone via the MLS voice gateway is allowed;

    checking, by the MLS voice gateway, if a generation of a non-secure warning tone locally by the source phone is required;

    receiving, by the MLS voice gateway, an acknowledgement of a local generation of the non-secure warning tone by the source phone; and

    establishing, by the MLS voice gateway, a cross-security domain call from the source phone to the destination phone.

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