An application integration system greatly improves the configurability and efficiency of integration of multiple disparate applications, such as those found in telecommunications service provider architecture. The application integration system disassembles messages into component parts and dynamically rebuilds the component parts into a target message compatible with a target system. The application integration system employs a highly configurable configuration mechanism that can be modified on the fly and adapted to meet the requirements of any number of different applications that may need to communicate across the telecommunications service provider architecture.