Panoramisk / The VoIP druid 

IAX is the preferred solution when interconnecting two Asterisk. In addition to voice cipher (see “IAX trunk and voice ciphering“) and secret based authentication, it could be interesting to bring the authentication to an upper level: RSA key verification.

The purpose of this article is to explain how to setup RSA authentication in IAX trunk but also how to use X.509 certificates to get RSA keys from.
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Voice transport should always balance between real time and bandwidth consumption. When interconnecting two PBX in order to exchange more than one communication, it could be interesting to limit bandwidth consumption by carrying more voice samples in the same IP frame. This is what the Asterisk Inter Exchange protocol (aka IAX) is doing and gains are real.
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Once decided to use voice over IP in order to place call to a public network, like Internet, we can be conscious about confidentiality of transit. On Asterisk an inter switch protocol over IP has been developed and it allows ciphering: IAX.
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