SIP2SIP
SIP2SIP is a real time communications service for audio, video, presence, chat, file transfer and multiparty conferencing based on WebRTC, SIP, XMPP and related protocols. The service is free to use based on a fair-use policy and federates with publicly reachable SIP and XMPP domains.
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Download Blink SIP client for Mac OSX and Windows
Use your WebRTC enabled browser for audio/video calls at https://webrtc.sipthor.net