SIP2SIP is a real time communications service for audio, video, presence, chat, file transfer and multiparty conferencing based on SIP signaling and related protocols (DNS, ENUM, RTP, MSRP and XCAP). The service is free to use based on a fair-use policy and federates with external SIP and XMPP domains.

SIP account or password forgotten?

For help or support visit the online wiki here.

Download Blink SIP client for Mac OSX and Windows