5G message access platform based on load balancing

5G message access platform mainly uses SIP technology. In actual production, Single SIP services cannot meet the requirements of hundreds of millions of users. Therefore, SIP services must provide load balancing capabilities. Adding a load balancer in front of multiple SIP service entry proxies is a common approach, but traffic balancing within a service is also an issue that needs to be addressed. Considering the business requirements and the internal structure of the system, this paper designs a high-availability solution, including the selection of load balancing at the entrance and the load distribution method within the network element. This paper first analyzes the characteristics of the current popular load balancer and then adjusts and selects the most suitable one for professional configuration according to business requirements. In addition, to meet SIP protocol requirements, specific load distribution methods are configured between NE. Finally, experiments verify that service traffic can be evenly distributed to different NE.