[Freeswitch-users] problems with freeswitch + zrtp in proxy-media mode

[Eli Burke]

Yes, inbound-zrtp-passthru is true. I think it gets set automatically when you turn on ZRTP. 

The config I'm testing with is a stock 'enable_zrtp=yes' build of HEAD circa last week, with proxy-media=true added to Local_Extension in the default dial plan.

-Eli

On Feb 1, 2013, at 6:00 AM, royj at yandex.ru wrote:

> Is there <param name="inbound-zrtp-passthru" value="true"/> in profile
> 
> On Thu, 31 Jan 2013 17:43:34 -0500
> Eli Burke <eburke at edge-net.net> wrote:
> 
>> I'm trying to use Freeswitch with an open source voip client called Linphone, but cannot manage to establish functioning ZRTP sessions. The problem *seems* to be related to the RTP stream's SSRC.  I'm trying to conclusively determine if the problem lies with Linphone, Freeswitch, or one of the underlying zrtp implementations (libzrtp and zrtpcpp).
>> 
>> Here's what I've determined so far:
>> 1) ZRTP support is compiled and functioning. I can establish ZRTP sessions between two iPhones running Groundwire. 
>> 2) linphone + ZRTP works correctly if I make a one legged call to a Freeswitch echo extension
>> 3) linphone + ZRTP works correctly if I turn on bypass-media
>> 4) linphone gets a CRC error when trying to verify the ZRTP packet on any two-legged call
>> 5) disabling the CRC check results in a successful ZRTP session, but the audio is extremely garbled
>> 
>> Is Freeswitch modifying the ZRTP packets when running in proxy mode? If so, how is it that some clients are able to handle this situation?