US Patent 10104237 Mitigating attacks on emergency telephone services

The disclosed system provides a Real-time Telephony (or Call) Monitor, Analyzer and Decision SIP Server (RTMADS) for mitigating attacks on emergency telephone systems. The RTMADS works in conjunction with an ingress node to fork incoming calls to an IMS network and the RTMADS. Within the RTMADS, forked telephone calls undergo data collection and mining, and parametric analysis. A decision matrix in the RTMADS uses the results of the data collection, mining, and parametric analysis, and other information, to make a decision with respect to incoming calls. For example, the RTMADS may decide to perform call setup on an incoming call using a dedicated or backup Public Safety Answering Point (PSAP), alert an Operations and Management (OAM) team regarding the incoming call, or accept and then terminate the incoming call.