[VOIPSEC] ZRTP and Asterisk

[satyam tyagi]

Its been a long time, but I think by default Asterisk tries to anchor media which maybe breaking ZRTP. 
You may want to set some configuration to relinquish media. 
Hopefully someone on the list more knowledgeable about Asterisk than I would be able to help you with what is needed to do that on Asterisk.

Thanks,
Satyam



> Date: Tue, 5 Aug 2008 15:09:16 -0300
> From: acabrera at sintys.gov.ar
> To: voipsec at voipsa.org
> Subject: [VOIPSEC] ZRTP and Asterisk
> 
> 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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