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This paper presents new embedded system architecture (ESA) for improving the voice quality in a WLAN/Cellular dual-mode mobile phone. The proposed architecture is based on a dual-core scheme and its main functional blocks are composed of VoIP Remote Procedure Call (VRPC), an audio bridging scheme, and a Server-Assisted Call Management (SACM) algorithm. In order to illustrate the aims of the proposed approach, prototype systems are implemented, and evaluated by measuring average Mean Opinion Score (MOS), and Mouth-To-Ear (M2E) delay. The experimental results show that the proposed approach results in greatly improved voice quality.