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IMPORTANT! - please test TiviPhone with your SIP service before buying the license! Software allows you to configure parameters for any SIP server and license key only allows to save the configuration changes permanently.

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ZRTP is described in the Internet-Draft as a "key agreement protocol which performs Diffie-Hellman key exchange during call setup in-band in the Real-time Transport Protocol (RTP) media stream which has been established using some other signaling protocol such as Session Initiation Protocol (SIP). This generates a shared secret which is then used to generate keys and salt for a Secure RTP (SRTP) session." One of ZRTP's features is that it does not rely on SIP signaling for the key management, or on any servers at all. It supports opportunistic encryption by auto-sensing if the other VoIP client supports ZRTP.
0€ (passive ZRTP license) 0€ 249€ 399€