Description: In this paper, a software-based SIP-phone software architecture and design to achieve the program. The program is embedded Windows CE as a platform, using open-source middleware SIP protocol stack oSIP/eXosip, through the protocol stack of transplantation and in the protocol stack on top of application development and achieving a SIP software phone. Test results show that the layout of the software phone in the PDA on Windows CE has a good voice call quality.
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