[Freeswitch-users] ZRTP error on call setup when dialling client uses ZRTP

[royj]

What about "full processing media mode" (without any options of proxying media) on the client, which supports zrtp. May be useful to provide a  description of the configuration

On Wed, 16 Jan 2013 12:30:54 -0000
"Ben" <ben122uk at gmail.com> wrote:

> Hi,
> 
> Do you mean proxy_media=true in the dialplan?  If so, setting proxy-media
> mode in the dialplan means that Freeswitch does not negotiate keys with the
> client.  This is not the desired setup.
> 
> When both devices use ZRTP and proxy media is set, the keys exchange
> directly between the clients, this seems to work fine.  It's when only one
> client uses ZRTP do I have the problem.
> 
> Thanks.
> 
> -----Original Message-----
> From: freeswitch-users-bounces at lists.freeswitch.org
> [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of royj
> Sent: 16 January 2013 12:11
> To: freeswitch-users at lists.freeswitch.org
> Subject: Re: [Freeswitch-users] ZRTP error on call setup when dialling
> client uses ZRTP
> 
> 
> What is the proxy-media mode on both sides, in both cases. It matters. In my
> case I have experienced this
> 
> On Wed, 16 Jan 2013 10:36:08 -0000
> "Ben" <ben122uk at gmail.com> wrote:
> 
> > Hi all,
> > 
> >  
> > 
> > My server is running the latest git stable build of Freeswitch, all 
> > config is default and server/clients are on simple LAN setup.  I'm 
> > having an issue when using ZRTP on one client only, specifically the
> dialling client.
> > 
> >  
> > 
> > The calling device has ZRTP enabled, and the called device does not.  
> > In this scenario, the FS server should act as a man in the middle and 
> > exchange keys with the calling device.  This results in the A leg 
> > being encrypted and the B leg un-encrypted.  However as soon as the 
> > key exchange initiates, the A client errors and tears down the call.  
> > What's strange is that when I initiate the call from the non-zrtp 
> > client to the zrtp client, the keys exchange fine between server and 
> > client A, and 2-way audio is present.  So it's only when it's the dialling
> handset do I have the problem.
> > 
> >  
> > 
> > I've then gone on and tested the same thing on the latest git, and the 
> > problem goes away.  So my question is, can anyone advise on what 
> > changes/patches have been applied to the latest git that has resolved 
> > this issue?  I've tried to search the git tree, but I'll be honest I'm 
> > a bit unfamiliar with how it works and I'm not sure that I'm searching
> properly.
> > 
> >  
> > 
> > The ZRTP device is an iPhone running Groundwire, and it doesn't seem 
> > to matter what codec I use.
> > 
> >  
> > 
> > Thanks for the help!
> > 
> >  
> > 
> >  
> > 
> 
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