Design and development of the intelligent SSW and SIP application server system

The previous circuit-based telephone service is evolving into the IP-based one with requirement integrating new data service. And session initiation protocol is being widely adopted as a signaling protocol for IP telephony. The IP telephone service is basically provided with the data-based service of video phone, VOD (voice on demand), game and etc. To fit this requirement, we can provide to subscriber of any device the basic telephone service with SSW(softswitch) and the various application service with AS (application server) system. In this paper, we present the design and implementation of a effective SSW and AS. Current AS is not simple and needs many messages to implement service. Design goals of our system are simple AS and intelligent SSW. SSW is multiparty call-leg interaction support, using service sets predefined. Therefore we can propose simple AS system making service with ease