What is SS7

                                                         Signalling System (SS7)                                  


signalling system (SS7) is an international wireless telecommunications protocols and was developed in 1975.
First there was SS5 after it becomes SS6 and now it's called SS7. There almost Telecommunication companies used
 SS7 protocol.SS7 is only used in GSM network with a frequency like  900 MHZ
                                                           

                                                                                                                                                                           SS7 has a specific layer which is very difficult to detect it's only detectable by the telecommunications companies, Intelligence and Police