Downloading SIP2SIP 2.1.1 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. SIP2SIP relates to Communication Tools. We recommend checking the downloaded files with any free antivirus.
This free software was originally produced by AG Projects. The most popular versions of the program are 2.1, 2.0 and 1.3. The program's installer file is commonly found as sip2sip.exe. SIP2SIP works fine with 32-bit versions of Windows XP/Vista/7/8/10/11.
From the developer:
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.
You may want to check out more software, such as Active Worlds, Cordless DUALphone Suite or Collanos Phone, which might be related to SIP2SIP.
Texting & Video calls