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 communication system to route telephony signals based on OLI. The communication system includes a telephony signaling system and a call processing system. The telephony signaling system receives a first signaling message over an originating line indicating a telephony number and in response, generates and transfers a second signaling message indicating the telephony number and the OLI for delivery to a call processing system. The call processing system receives the second signaling message, and in response, processes the telephony number to identify a RespOrg. The call processing system processes the OLI based on the identified RespOrg to select a CIC. Call processing system generates and transfers a third signaling message indicating the selected CIC for delivery to the telephony signaling system. The telephony signaling system receives the third signaling message, and in response, generates and transfers a fourth signaling message for delivery to a telephony network based on the selected CIC.

Abstract: A method for operating a communication system is provided. The method includes monitoring traffic within a communication network to determine a traffic volume, and determining a routing table update rate based on the traffic volume. The method also includes receiving a routing table update, and updating a routing table using the routing table update at a time based on the routing table update rate.