[VOIPSEC] ZRTP and Asterisk

[Diana Cionoiu]

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
>
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