MicroSIP is not available for Linux but there are some alternatives that runs on Linux with similar functionality. The best open source Linux alternative is Wire. It's not free, so if you're looking for a free alternative, you could try Wire or Linphone. If that doesn't suit you, our users have ranked more than 25 alternatives to MicroSIP and six of them are open source and available for Linux so hopefully you can find a suitable replacement. Other interesting open source Linux alternatives to MicroSIP are Blink, Twinkle and YakYak.
Secure communication platform featuring encrypted chats and calls, file and media sharing, self-deleting messages, device verification, group collaboration, and customizable settings. Supports use across multiple devices with no phone number required for access.
Linphone is one of the most famous open source softphones in the world. It is fully SIP-based, for all calling, presence and IM features.
Yate is a softswitch (concept of separating the network hardware from network software).
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its not a SIP client, its PAID social network.