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

[royj]

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?
> 
> Thanks for any suggestions,
> Eli
> 
> 
> 
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