[Linphone-developers] patch to add linphonerc flag always_offer_zrtp

[Eli Burke]

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.

always_offer_zrtp.patch
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