The Session Initiation Protocol (SIP) is a multimedia signalling protocol that has evolved into a widely adopted communication\r\nstandard. The integration of SIP into existing IP networks has fostered IP networks becoming a convergence platformfor both realtime\r\nand non-real-time multimedia communications. This converged platform integrates data, voice, video, presence, messaging,\r\nand conference services into a single network that offers new communication experiences for users. The open source community\r\nhas contributed to SIP adoption through the development of open source software for both SIP clients and servers. In this paper, we\r\nprovide a survey on open SIP systems that can be built using publically available software.We identify SIP features for service development\r\nand programming, services and applications of a SIP-converged platform, and the most important technologies supporting\r\nSIP functionalities.We propose an advanced converged IP communication platformthat uses SIP for service delivery. The platformsupports\r\naudio and video calls, along with media services such as audio conferences, voicemail, presence, and instant messaging.\r\nUsing SIP Application Programming Interfaces (APIs), the platform allows the deployment of advanced integrated services.\r\nThe platformis implemented with open source software. Architecture components run on standardized hardware with no need for\r\nspecial purpose investments.
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