I want to make a VOIP /IM server in Debain .What is the most secure software i can use? It will be used by a couple of people and running 24/7.

  • can be in beta or alpha
  • should have really good encyption such as AES 256 bit or better
  • no backdoors
  • open-source
  • Audio only
  • 2 people maybe 3
  • log in required
  • no resource limit
  • There will be no file sharing over IM
  • Open id or anyother protocols
  • 2
    How do you define "most secure"? Some metric, gut feeling?
    – sashoalm
    Aug 2 '16 at 11:34
  • Secure as in really good encyption such as AES 256 bit or better encyption with no backdoors and open source. Aug 2 '16 at 11:43
  • 2
    That encryption then also needs to be supported by the clients. What protocol(s) must be supported? Is "audio-only" sufficient, or do you need video (and text-typing) facilities? Conferencing? Speaking of "IM": file exchange (and if yes, malware check for those files)? Link evaluation (e.g. verifying shortened links)? Are there any resource limits (RAM/disk/CPU)? How many users? What about registration: should everyone just be able to use it, or do you need account management included? If so: SSO required, and again which protocols (e.g. OpenID) for that?
    – Izzy
    Aug 2 '16 at 11:52
  • 2
    Combining requirements most secure and can be in beta or alpha sounds a bit strange...
    – user416
    Aug 2 '16 at 12:34
  • True but I dont think there is alot of software out there that meets my requirments. Aug 2 '16 at 12:37

if you want to stick with the well known standards sip, srtp and zrtp have a look at Ostel or to be more concrete OSTN from the Guardian Project.

for a "closed environment/user-base" Mumble (with its server Murmur) can be interesting.

well... or you can take a look at "new" projects in early stages like Tox (NaCl-encryption) or Ring (because of dht without a central server), but i won't recommend them for production environments because the are under (heavy) development!

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