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Re: [Linphone-developers] patch to add linphonerc flag always_offer_zrtp

From: Johan Pascal
Subject: Re: [Linphone-developers] patch to add linphonerc flag always_offer_zrtp
Date: Wed, 13 Jul 2016 18:07:59 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Icedove/38.8.0

Hi Eli,
thanks for your patches. I'll have a look at them next week. I think you already sent a signed contributor agreement but your colleague Trevor Alpeter probably did not.
Could he send us one.



On 13/07/16 16:22, Eli Burke wrote:
This patch adds a new linphonerc flag and supporting logic to force Linphone to offer ZRTP on all streams on outgoing calls (regardless of the configured media encryption type). Similarly for incoming calls it detects ZRTP offered in conjunction with other media encryption types, which allows Linphone to negotiate ZRTP on the SAVP profile (in practice it negotiates SRTP first, then ZRTP, updating the key on the existing stream).

The default value is off, unchanged from existing behavior. Turning it on will add a zrtp-hash line to all outgoing streams. This enhances security when operating in a mixed client environment with clients that only support SRTP, require ZRTP, or prefer DTLS.

Thanks to my college Trevor Alpeter who took point on solving this issue for us.

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