From: https://github.com/akibsayyed/safeseven

safeseven – SS7 Assessment Tool. Simulates an SS7 network (HLR, MSC/VLR, STP) and supports SMS, USSD, call-handling, and mobility operations for security testing and research. Includes a vulnerable Diameter network (dvdn) for S6a interface testing. Requires Linux with SCTP support and JRE 1.7+. Study SS7/SIGTRAN and MAP protocol specs before use.