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SJphone was an early Voice over IP softphone for making calls through internet connections. The software uses the open SIP protocol for signaling and media transport. SJphone offered a user-friendly interface with basic call features such as call hold, transfer, and conference calling, as well as advanced codecs including G.722 wideband audio for improved voice quality. Throughout its lifetime, SJphone gained popularity in the early VoIP community while also facing competition from other softphones that emerged in the market offering more sophisticated capabilities and integration with different services.

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