VoIP encryption recommendations

[Bipin Patel]

hi,

i would like the ask the community about VoIP encryption, currently in 
few middle east countries VoIP is officially blocked. The isp are so 
aggressive that they use all sorts of fancy tools to block it including 
skype calls, whatsapp calls etc and are very successful in doing it. So 
far companies like voipswitch and recently few others have been 
providing tunneling mechanisms  to get over this but recently UDP 
traffic is heavily filtered and they go to the extreme of checking 
packet length and pattern and artificially introduce delay, jitter or 
simply block it if the number of hits are high. Switching to TLS/SRTP 
also doesnt help, it works with some isp but as soon as you try same 
using mobile data it stops working coz they match packet length and 
block based on the profile. ZRTP doesnt work coz a normal RTP streams 
needs to start and then it starts encrypting it but those initial RTP 
get blocked.

With lack of any more VoIP encryption protocols its almost getting 
impossible to bypass block so has anyone have any ideas of any other 
modern form of encryption which can be used for VoIP (btw VPN are also 
blocked and more over if packet size increases then nothing works on 
mobile data).

The market demand of skype replacements is also extremely high coz 
skype, hangouts, whatsapp video, instagram video, viber etc etc, u name 
it and its blocked.

-- 
Regards,
Bipin


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