SIP2SIP.info - free SIP account for voice, video, IM and Presence:
"SIP2SIP is a real time communications service for Audio, Video, Presence, Chat, File Transfer and multiparty conferencing based on SIP signaling and related media protocols (RTP, MSRP and XCAP). The service is free to use based on a fair-use policy and federates with external SIP and XMPP domains. "
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