l focus on 5G Fixed Mobile Convergence (FMC), which enables 5G for broadband networks. We will look at the drivers of and challenges for 5G FMC and the architecture that facilitates the convergence. We will discuss the initial procedures that Residential Gateways (RGs) perform to gain access to 5G services. We will explore how 5G FMC can be made secure. Gartner describes FMC as a "Device and infrastructure technology trend that enables the transparent use of voice and data applications across the fixed and mobile access points" (see https://www. gartner.com/en/information-technology/glossary/fmc-fixed-mobile- convergence). This chapter will discuss the considerations for the convergence technology for 5G. It will go into the system architecture used to facilitate FMC. We will discuss structural and functional convergence. Furthermore, we will explore the details of FMC, such as the role of Protocol Data Unit (PDU) sessions (seehttps://datatracker.ietf.org/doc/draft-allan-5g- fmc-encapsulation/08/). In this chapter, we will cover the following topics: Introduction to FMC in 5G FMC architecture FMC security considerations Introduction to FMC in 5G FMC blurs the line between fixed and wireless mobile networks. Its goal is to create a seamless consumer experience by leveraging the best of fixed broadband and wireless networks. With FMC, a voice call can be transferred between a mobile or cellular network and fixed or broadband network without any interruption for the end user. Such services are also referred to as network-agnostic services. The biggest benefit of FMC to the consumer is convenience. It allows reaching a person by using a single phone number, irrespective of where that person is. For businesses, it helps to improve customer 5G Fixed Mobile Convergence experience. Businesses can bring their point of presence closer to the target market. Wireless 5G provides agility, and FMC offers enterprise-grade capabilities that are traditionally limited to wired access. Some of the common FMC use cases are listed he