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This paper proposes an architecture integrated with P-mail Deluxe Protocol (PDX) and Multimedia Message Service (MMS) to provide the Interoperability of the multimedia messaging between Personal Handy System and General Packer Radio Service (GPRS) networks. The proposed architecture includes an MMS-P-mail Gateway (MPG), within three messaging services units, i.e., multimedia messaging relay, adaptation and configuration unit. Through the MPG gateway provides bi-directionally seamless routing, protocol conversion, reformatting, and transmission of the multimedia message. The proposed architecture leverage on the integration with PHS and GPRS networks to expand the MMS usage volume. An implementation of the MPG is described in this paper as an illustration of the feasibility of the proposed architecture.