Description: GSM-VoIP is a technology that combines the capabilities of the GSM (Global System for Mobile Communications) network with Voice over IP (VoIP), allowing voice transmission over the Internet instead of traditional telephone lines. This integration offers several advantages, such as reduced call costs, especially for international communications, and the ability to use mobile devices to make calls over data networks. GSM-VoIP enables users to enjoy improved voice quality and greater flexibility in managing their communications. Additionally, this technology benefits from the existing GSM infrastructure, facilitating its implementation across various platforms and devices. The combination of these two technologies has changed the way people communicate, allowing for greater interoperability between different networks and devices. In the context of security in modern networks, GSM-VoIP also presents challenges and opportunities, as data transmission over IP networks can be susceptible to cyberattacks, necessitating the implementation of robust security measures to protect the privacy and integrity of communications.