[Freeswitch-users] How can I trigger a ZRTP connection on an existing call?

[Brian West]

ZRTP happens in the media stream, what you're seeing is a zid in the sdp,
which doesn't mean that it will start the ZRTP exchange, your client or FS
will have to trigger the start by doing the hello, which isn't what you
want.

On Tue, Feb 10, 2015 at 11:58 AM, Peter Steinbach <lists at telefaks.de> wrote:

>  Hello Brian,
>
> thanks for the hint. In the meantime, I tried both, setting zrtp globally
> in Freeswitch and having zrtp in the original dialplan and in the
> {}-Variables for dialing the B party. This did not help.
>
> Then I totally disabled ZRTP inside FSs and in the dialplans and grepped
> on the network. Then I issued a "uuid_media off" for starting a reinvite
> between the 2 endpoints. On the Freeswitch console, I could see, that ZRTP
> is exchanged in the SDP, although Freeswitch does a reinvite with ZRTP.
> Having a look at the channel variables, I could see that
>
>    - variable_rtp_local_sdp_str does _not_ contain ZRTP
>    - variable_switch_m_sdp _does_ contain ZRTP
>    - variable_switch_r_sdp _does_ contain ZRTP
>
> But ZRTP however is not started on both sides. Then I killed Freeswitch
> during a call and started again, the calls were automatically recovered,
> and ZRTP was there. But this was surely done with a normal invite, right?
>
> I tried with CsipSimple on Android and Jitsi nightly on Ubuntu. Both
> clients behave the same. I assume, that they will not start ZRTP on a
> reinvite.
>
> So unless there is now way to reistablish a call (I tried uuid_transfer to
> the same number with autoanswer, but target number was still considered as
> busy), I think it will not work.
>
> Any other hints?
>  Best regards
> Peter
>
>
>
>
> On 02/10/15 16:05, Brian West wrote:
>
> You can't set the zrtp_secure_media=true after a session is created, it
> needs to be a global or you set it inside the {} on the bridge or originate
> line.    Then you're outlining uuid_media off, which would make the media
> go between the two endpoints, FreeSWITCH isn't even involved in the zrtp
> exchange at that point.  Technically your endpoints should be the ones
> doing this and ZRTP should be disabled in FreeSWITCH, You really only need
> ZRTP with MiTM if you MUSt transcode or you're terminating directly on the
> FreeSWITCH instance.   I should really just rip out MiTM support.
>
> On Tue, Feb 10, 2015 at 5:53 AM, Peter Steinbach <lists at telefaks.de>
> wrote:
>
>>  Hello,
>>
>> I want to establish ZRTP, after I am bridging 2 calls, which have been
>> active already before.
>>
>> My scenario is as follows:
>>
>>    - Caller A is calling Freeswitch, the call is answered and an
>>    announcement is played
>>    - In the meantime Freeswitch calls another Party B and connects it to
>>    an internal IVR, where also announcements are played.
>>    - Now, after a while, I decide to connect the calls together, then
>>    send an "uuid_media off <uuid>" to the calling party A leg, reinvites occur
>>    and bypass media works.
>>    - However the 2 SIP clients (Csipsimple) do not start a ZRTP session
>>    - If caller A calls B directly via bypass media, the ZRTP is active,
>>    by the way.
>>
>> I suspect that ZRTP somehow should be forced or triggered. Is there a way
>> to do that? I already invited the B leg with "zrtp_secure_media=true" and
>> issued
>>
>>   uuid_setvar 1bd508af-19c7-4e38-8621-731baaf33920 zrtp_secure_media true
>>   uuid_media off 1bd508af-19c7-4e38-8621-731baaf33920
>> to the A leg. But this did not work.
>>
>> The main question should be: How can I trigger a ZRTP connection on an
>> existing call?
>>
>> --
>> With kind regards
>> Peter Steinbach
>>
>> Telefaks Services GmbHmailto:lists <lists> (att) telefaks.de
>> Internet: www.telefaks.de
>>
>>
>> _________________________________________________________________________
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>> http://www.freeswitchsolutions.com
>>
>> Official FreeSWITCH Sites
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>> http://confluence.freeswitch.org
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>>
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>
>
>
>  --
>
> *Brian West*
> brian at freeswitch.org
>
>
>  *Twitter: @FreeSWITCH , @briankwest*
> http://www.freeswitchbook.com
> http://www.freeswitchcookbook.com
>
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>
>
> _________________________________________________________________________
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>
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>
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>
>
> --
> With kind regards
> Peter Steinbach
>
> Telefaks Services GmbHmailto:lists <lists> (att) telefaks.de
> Internet: www.telefaks.de
>
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://confluence.freeswitch.org
> http://www.cluecon.com
>
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
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>



-- 

*Brian West*
brian at freeswitch.org


*Twitter: @FreeSWITCH , @briankwest*
http://www.freeswitchbook.com
http://www.freeswitchcookbook.com

*T:*+19184209001 | *F:*+19184209002 | *M:*+1918424WEST (9378)
*iNUM:*+883 5100 1420 9001 | *ISN:*410*543 | *Skype:*briankwest
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