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.

Download Blink SIP client for Mac OSX and Windows

Use your WebRTC enabled browser for audio/video calls at