Abstract: Examples disclosed herein provide systems, methods, and software to validate calls to end telephone numbers. In one implementation, a method of operating a call state service includes obtaining and storing call state information for one or more communication in at least one data structure. The method further provides receiving a call state request for a communication of interest, wherein the request includes relevant call state information. The method also provides determining whether the relevant call state information matches a communication in the one or more communications based on the at least one data structure, and, if a match is identified, returning a call state match notification to the requesting end service.

Abstract: A route manager queries a new network element to identify egress routes coupled to the network element and to identify external nodes coupled to the egress routes. The route manager queries a database with identifiers for the external nodes to identify associated telephone numbers. For each telephone number associated with an external node, the route manager associates the telephone number with the egress routes coupled to the external node and with the new network element. The route manager receives a call request to one of the telephone numbers, and in response, selects the new network element and one of the egress routes associated with the telephone number.

Abstract: A route manager queries network elements to identify egress routes and external nodes coupled to the network elements. The route manager queries a database to identify telephone numbers associated with the external nodes. For each telephone number associated with an external node, the route manager associates the telephone number with the egress routes coupled to the external node and with the network elements coupled to the egress routes. On a call, the route manager selects one of the network elements and the egress routes associated with the telephone number.