There are many startups that provide cloud-phonesystems, some of them do also have webrtc-implementations right now.
Some do have a own voip/sip client, but alomst any of the clients do lack in usability, UI (sometimes very old), stability, maintenance and/or cross-platform support.<p>I am looking for a SIP-Client for Windows which does simple provide a "just-working" calling-feature in a modern and stable UI / UX.
It would be great, if the same tool is provided for iOS with call-kit integration.
Open-source would be an awesome bonus.<p>I am happy to pay for the software, but just can't find one. Do you know one?
Mumble has been around for ages and is open source.<p><a href="https://www.mumble.info" rel="nofollow">https://www.mumble.info</a><p><a href="https://github.com/mumble-voip/mumble" rel="nofollow">https://github.com/mumble-voip/mumble</a>