Cspace and Trilight software

[Александр]

Seth

I haven't found a reliable, usable, simple, free software VoIP
client for Linux


This is the best I see. For most of the platforms.
https://jitsi.org/Main/Download
https://github.com/jitsi/jitsi

>From their page:

Encrypted password storage
> Password protection with a master password
> Encrypted Instant Messaging with Off-the-Record Messaging (OTRv4)
> Chat authentication with the Socialist Millionaire Protocol over *OTR*
> Call encryption with SRTP and *ZRTP* for XMPP and SIP
> Call encryption with SRTP and SDES for XMPP and SIP
> DNSSEC support
>
> TLS support and certificate-based client authentication for SIP and XMPP
>
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