[VOIPSEC] ZRTP and Asterisk

[Alejandro Cabrera Obed]

Thanks Diana, sorry if I can't understand at all, I have this:

SIP Client ------SIP/RTP/ZRTP-----ASTERISK-----SIP/RTP/ZRTP------SIP Client

SIP Client-to-SIP Client: there is no direct communication at all

Do you think if I use Asterisk last version and patch it with the ZRTP
module from Phill Zimmerman taken from www.zfone.org is it the unique
way to have ZRTP with Asterisk ???

Or isn't there any customized configuration from Asterisk ???

Thanks again !!!

Diana Cionoiu wrote:
> Hello Alejandro,
>
> That is happening because Asterisk doesn't let the ZRTP to go directly
> between the phones.
> However you can use Yate instead of Asterisk to do that, or just patch
> Asterisk.
> In Yate however you will need rtp_forward for that route.
>
> Diana
>
> Alejandro Cabrera Obed wrote:
>> Dear all, I have Asterisk 1.4.13 as a SIP server routing all the RTP
>> calls through it (there ara not any RTP traffic client-to-client) with
>> two types af clients: Twinkle+libzrtp and SJPhone+Zfone, both managing
>> ZRTP as the encryption method for SIP/RTP conversations.
>>
>> I read from Phill Zimmerman that ZRTP only works if I apply a patch to
>> my Asterisk, but now I haven't any patch in my Asterisk and ZRTP works
>> among Twinkle clients but doesn't work among SJPhone-to-SJPhone nor
>> Twinkle-to-SJPhone clients.
>>
>> Why can I use ZRTP in Asterisk just among Twinkle clients ??? After
>> click on the SAS (short authentication string) I see the lockpad in the
>> clients and I can  encrypt the calls.
>>
>> Do you know the way to successfully implement ZRTP on Asterisk
>> nowadays ???
>>
>> Thanks a lot
>>
>> Alejandro
>>
>> _______________________________________________
>> Voipsec mailing list
>> Voipsec at voipsa.org
>> http://voipsa.org/mailman/listinfo/voipsec_voipsa.org
>>   
>


-- 
Ing. Alejandro Cabrera Obed
Interconexion
SINTyS
Sistema de Identificacion Nacional Tributario y Social
Consejo Nacional de Coordinacion de Politicas Sociales
Presidencia de la Nacion
Julio A. Roca 782 - Piso 5
Ciudad Autonoma de Bs. As.
Tel: (54 11) 4343-0181/89 interno 5172
4334-3676 4342-5648
acabrera at sintys.gov.ar

NOTA DE RESPONSABILIDAD:
----------------------------------------------------------------------
Este mensaje proviene de Internet,tome los recaudos necesarios en su
manejo.
El contenido del presente mensaje y sus adjuntos es privado,
estrictamente confidencial y exclusivo para su destinatario, pudiendo
contener información protegida por normas legales y de secreto
profesional.
Bajo ninguna circunstancia su contenido puede ser transmitido o revelado a
terceros ni divulgado en forma alguna. En consecuencia de haberlo recibido
solicitamos contactar al remitente y eliminarlo de su sistema.
--------------------------------------------------------------------------