An embedded software approach for the development of SIP-based VoIP server

In this paper, embedded software engineering approach is employed for the development of a SIP-based VoIP server. Signaling control functions of SIP servers are integrated and implemented in an embedded system platform. This embedded SIP server also serves as network access server (NAS) client to a centralized RADIUS server to provide user´s authorization, authentication, and accounting information. Other advanced telephony features, such as voice conferences, call waiting, call on-hold, etc, can be designed in the embedded SIP server as well. In this study, the embedded software architecture and development procedure for the embedded SIP server such as hardware platform, the embedded software function, development procedures, and functional test are described. This embedded SIP server can be beneficial for frequent computer users with larger telephone usage, such as people working in global branch offices of enterprises, schools on the academic communication backbone, or research institutes among Universities on an academic broadband infrastructure.