July 2016
Intermediate to advanced
300 pages
6h 49m
English
Content preview from Mastering FreeSWITCHBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Encrypting (S)RTP via ZRTP (key exchange in RTP)
ZRTP is a method for the end-to-end exchange of encryption keys. Caller and callee will directly exchange the keys that will be used to encrypt the audio stream, without any third-party intervention. No proxy is involved; no information is exchanged in SIP(S) or SDP: Key exchange is peer-to-peer via Diffie-Hellmann, in the RTP stream itself, in its initial phase.
ZRTP is compiled by default in FreeSWITCH. If clients support ZRTP, the session will be encrypted in the safest mode possible.
ZRTP is a young protocol, and is already implemented by some softphones (Blink, CSipSimple, iCall, Jitsi, Linphone, Phoner, SFLPhone, Twinkle, Zfone, and Zoiper has announced) but by almost no hardphone or ATA.
There ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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