A system is disclosed for facilitating conversational and non-conversational transactions between thin-clients and MFS-based IMS applications. The system includes components for storing conversation attributes associated with a conversational transaction between a thin-client and an MFS-based IMS application, the conversation attributes comprising connection information and conversation-specific information. Next, one or more transaction messages from the thin-client are preprocessed based on a transaction message type. The stored conversation attributes are updated in response changes in the conversation attributes caused by the one or more transaction messages. Then, a conversation output message is formatted for the thin-client. The system may include a security module that authenticates user, a connection module that establishes a connection with an MFS-based IMS application, a state module that preserves and maintains conversation attributes, and a control module to process a transaction message having one or more transaction message types.