The present disclosure describes techniques for detecting and mitigating a spoof communication within a network, such as a Session Internet Protocol (SIP) network. More specifically, a SIP server, may receive a call request to initiate a Voice over Internet Protocol (VoIP) communication between an originating device and a recipient device. In response, the SIP server may analyze registration data associated with a subscriber account of the originating device, and in doing so, infer whether the call request is a spoof communication.