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[liberationtech] Heavily drop packets in VOIP services in Iran

Travis Biehn tbiehn at
Mon May 4 06:07:14 PDT 2015

Did you try ZRTP? Log traffic with wireshark? AFAIK there's no teardown
message for the UDP channel used for voice data, would they not have to
spoof some RTSP teardown message to your client?

Try HTTPS on a non-standard port?

It might be interesting to enable peer to peer transfers of whatever you're
offering in meatspace, such as a utility to auto-format and provision USB
drives / cds with aforementioned tools.


On Sun, May 3, 2015, 6:12 PM Nariman Gharib < at> wrote:

> Hi Libtech,
> I don't know how many of you guys are following situation in Iran, but
> many people in west are thinking because of President Rouhani, Internet
> censorship situation is getting change and getting better in Iran. but
> nothing happened yet. Yes, you haven't heard anything related to blocking
> apps,popular services or websites but in other hand they are doing 'smart
> filtering' and applying 'drop packet' on some ports and IPs and HTTPs
> protocol.
> Today for example, I missed my mother and I tried to talk to her on the
> Viber. every seconds our connection gets dropped. I recorded this event and
> you can see here:
> another person on twitter said that: you can't make a correct call within
> Iran, Just 'Line' is works and that one is stopped working every minutes.
> Then users are suggested him, services like: Skype and Hangout , webex
> by the way, between between Feb 3, 2015 – May 3, 2015, I've received more
> than 1m Download requests from Iran for downloading circumvention tools but
> sadly because i stored my files on AWS and amazon is using HTTPs, most of
> times users are having issue to complete the download process. I think it's
> because of drop packet which government applied on Internet. (I'm not
> expert)
> I prepared a small report to give you an idea to what's happening.
> This report contain URL+Hits (Requests)+Bandwidth Outbound+
> Complete(Bytes)Transfers (Requests)
> Thanks
> N
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