Summary

IAX has the potential to be a very popular protocol for VoIP architectures because of the growing popularity of the Asterisk PBX system. Its simple nature, friendliness with network firewalls, reliance on a single UDP port, unified signaling and media transfer protocol, and relatively few network components (no media proxies, gateways, gatekeepers, or STUN servers) make it very attractive. Despite the many operational and functional advantages over SIP or H.323, though, it does not fare much better in terms of security. In fact, the authentication weaknesses of SIP and H.323 are mirrored, and are in some cases worse, in IAX. Furthermore, the lack of use and/or support for encryption in media transfers is very similar between IAX and RTP. ...

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