Eyebeam was one of the first mass-market SIP softphones. It allowed users to make VoIP calls from a PC using providers like Vonage, BroadVoice, or any SIP-compatible PBX.
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If you are setting up a VoIP system, I can help you configure an alternative. Let me know: Your (Windows, macOS, Linux?) Whether this is for personal or business use If you already have a SIP/VoIP service provider Eyebeam was one of the first mass-market SIP softphones