Skype analogue, what?

Question

linux

Hello.
We need an analogue of Skype, which would first of all satisfy the following requirements:
1) Confidentiality (security, encryption and protection).
2) Audio and text communication (video is not interested).
3) Cross-platform (win, *nix, mobile applications).
4) Free.
Calls to landlines or mobile phones are not of interest, i.е. communication within this application is required.
What analogues can you recommend?

Answer 1

jitsi

Answer 2

jabber (audio enabled clients) like psi, gpg encryption almost out of the box

Answer 3

Mumble
Encrypts all communication over SSL, it is possible to encrypt all traffic using I2P.
Windows, Mac, Linux, Android

Answer 4

SafeUM is suitable for all requests

Answer 5

oovoo

Answer 6

if you want an analog of a scape, then you need a program.
I would suggest considering sip softphones that support secure rtp.
Of the cross-platform ones, I like qutecom and zoiper.
The first is built around the contact list and chat, the second is built around the dialpad. Just a different concept.

Answer 7

OOVOO
www.oovoo.com
Free. Platforms: Win, Mac, Android, iOS. Unfortunately no Linux

Answer 8

google talk?

Answer 9

You can try teamspeak. It seems there were plugins that encrypt traffic. Perhaps you will find a comment useful for yourself:
habrahabr.ru/post/123711/#comment_4065876

Answer 10

TeamSpeak, 32 licenses included, 512 organization licenses/Physics (NPL license, optional, free).
Able to encrypt.
Key authorization
Win, Mac, Linux, Android (Beta)