A method, system and computer program for inter-working between different wireless technologies. The method including connecting a base station wirelessly connected to a mobile terminal, both complying with standardized wireless radio access technology, with a MME and/or a SGW of the EPC of the 3GPP standard by a NAS function included in the base station. The NAS function collecting a MAC address of the mobile terminal and generating an IMSI identity based on the collecting; providing the generated IMSI to the MME and storing it together with a set of parameters and algorithms; performing, with the MME or with a HSS an authentication and ciphering procedure of the mobile terminal using the stored set of parameters and algorithms, and performing the termination of the NAS protocol messages with the MME for management procedures related with the mobile terminal, the wireless radio access technology and the 3GPP standard being different technologies.