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Re: [Linphone-developers] ZRTP and TLS

From: Werner Dittmann
Subject: Re: [Linphone-developers] ZRTP and TLS
Date: Tue, 14 Jan 2020 22:34:34 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1

Actually, if you use ZRTP then there is no need to use TLS for SIP because ZRTP 
it's keys inband end-to-end using RTP over UDP. This is the main difference to 
SDES where the
key parameters are embedded within SIP headers and thus you must run SIP over 

An application may use a SIP header to signal that it uses ZRTP, however, this 
is optional
and many applications don't use it.


Am 14.01.20 um 01:23 schrieb ahmed rayan:
Hi all, I want to know , if I used ZRTP , what is the needed of TLS ???

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Werner Dittmann
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