[Freeswitch-users] ZRTP call setup

Ben ben_naylor1942@hotmail.com ben122uk at gmail.com
Tue Jul 3 16:18:29 MSD 2012

Hi All

Please ignore, I had misconfigured something in the dialplan!


On Tue, Jul 3, 2012 at 1:03 PM, Ben  <ben122uk at gmail.com> wrote:

> Hi Freeswitch community!
> Could someone advise on how you have the a-leg as a non-ZRTP client, and
> the b-leg as a ZRTP client, with trusted main-in-the-middle?
> I have set up trusted man-in-the-middle with the server, which works well
> when making an outbound call from the ZRTP client to the standard SIP
> client.  The INVITE from the ZRTP client includes the zrtp hash in the SDP
> info, which I'm presuming highlights to freeswitch that the call will be
> using ZRTP for this leg.  The Freeswitch then decrypts the ZRTP ready for
> the b-leg.  Everyone's happy.
> However, when going the other way, the INVITE from the non-ZRTP device
> does not include zrtp hash.  So the INVITE passed to the ZRTP client does
> not include a ZRTP hash, which then causes the ZRTP client to fail.  I have
> tried getting around this by adding the following in the dialplan -
> <action application="set" data="zrtp_secure_media=true"/>
> But the freeswitch doesn't create the zrtp hash in the INVITE.
> Is there something I can do in Freeswitch to say "all calls to this phone
> must use ZRTP (hash), whether the original INVITE uses ZRTP or not"?
> Thanks in advance for the help!
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