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

Ben ben122uk at gmail.com
Wed Jan 16 15:30:54 MSK 2013


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.


-----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
> 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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