[Linphone-developers] Failure to establish ZRTP sessions using linphone-iphone built from source

[Eli Burke]

I have compiled linphone-iphone from source, using "make all 
enable_gpl_third_parties=yes enable_zrtp=yes"  and am now trying to verify the 
functionality of the ZRTP integration. So far, I am not able to establish a 
ZRTP-secured connection (SRTP works fine).

Has anyone successfully used linphone with ZRTP since Linphone 2.0 was 
released? I know ZRTP is not enabled in the App store version, so it would have 
to be tested using a version you've built yourself.

Some additional background: we are using Freeswitch and can successfully 
establish ZRTP calls using the Groundwire app. When I try to call between 
Groundwire and Linphone, I either get an unprotected phone call, or if I set 
Groundwire to require ZRTP, it immediately hangs up. I also tried calling 
between two instances of Linphone, and got the 'insecure call' icon. (vs SRTP 
which showed the 'secure' padlock)

Other notables:
So far I have only tested in the Simulator, so it is possible ZRTP only works 
on live hardware.
and
This is speculation, but to my untrained eye it looks like during an outbound 
call 'zrtp-hash' is not listed in the SDP header, and in an incoming call it is 
not being parsed.

Does anyone have any suggestions or thoughts?

Thanks,
Eli