[asterisk-users] VoIP encryption with SIP and IAX

Dear all, I have an Asterisk server with SIP and IAX softphones clients, and I need to encrypt the voip calls among them:

*For SIP clients I use Twinkle which implements the ZRTP/SRTP encryption mechanism client-2-client; I read it's the better security mechanism nowadays created by Phill Zimmerman who created PGP.

*For IAX clients I used Kiax but I don't know exactly if there is any encryption mechanism for this protocol.

Two short questions:

1) Do you think ZRTP/SRTP is the best option to encrypt SIP voip calls ???

2) What is the best way to encrypt IAX voip calls ???

Really thanks

Alejandro

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