US Patent No. 9,247,478

CALL ROUTING USING DOMAIN NAME SERVICE AND ELECTRONIC NUMBER MAPPING


Patent No. 9,247,478
Issue Date January 26, 2016 
Title Call Routing Using Domain Name Service And Electronic Number Mapping
Inventorship Hal S. Beech, Olathe, KS (US)
Nicolas A. Nehme Antoun, Olathe, KS (US)
Trey Allen Hilyard, Olathe, KS (US)
Assignee Sprint Communications Company L.P., Overland Park, KS (US)

Claim of US Patent No. 9,247,478

18. A system for routing mobile device calls based on a converted telephone number of a mobile device, location information
of the mobile device, and trunk group identifiers, the system comprising:
an originating switch configured for:
generating a query requesting one or more routes for a mobile device call, the query comprises the converted telephone number
of the mobile device and location information of the mobile device;

receiving one or more responses identifying, the one or more routes for the mobile device call, the one or more responses
each comprising an originating trunk group identifier, an originating trunk group identifier and a terminating trunk group
identifier, wherein the originating trunk group identifier includes an egress trunk group and the terminating trunk group
identifier comprises an egress trunk group for a next hop tandem switch; and

upon receiving the one or more responses, routing the mobile device call using an egress trunk group of a response;
a centralized routing function configured for:
receiving the query requesting one or more routes for a mobile device call, the query comprises the converted telephone number
of the mobile device and location information of the mobile device;

in response to the query, generating one or more responses
identifying, the one or more routes for the mobile device call, the one or more responses each comprising the originating
trunk group identifier and the terminating trunk group identifier, wherein the originating trunk group identifier includes
the egress trunk group and the terminating trunk group identifier comprises the egress trunk group for a next hop tandem switch;
and

communicating the one or more responses to the originating switch for routing the mobile device call.