OPTIMIZING AAA-DRA-OCS CONNECTIVITY IN DIAMETER ARCHITECTURES: THE CASE OF « DIAMETER_REALM_NOT_SERVED (3003) » ERRORS AND «DIAMETER_UNABLE_TO_DELIVER (3002) » ON THE Ro INTERFACE

This article addresses the optimization of connectivity between AAA server, DRA router, and OCS( Online Chariging System\0, real time billing platform components in Diameter-based architectures, focusing on critical errors such as DIAMETER_REALM_NOT_SERVED (3003) and DIAMETER_UNABLE_TO_DELIVER (3002) on the Ro interface. Through a field analysis of network traces and system configurations in a real LTE environment, recurring errors were identified, particularly those related to misconfiguration of routing parameters during the initial integration phase. Practical solutions and technical recommendations are proposed to enhance Diameter routing reliability and ensure efficient real-time charging.