Every phone call you make is at risk. The risk is snooping, either by government or network users. Most calls traverse the world via VoIP and both the metadata and voice data are sent unencrypted.
We created Ghost Call to change all of that. It is a unique service that allows you to make secure anonymous calls.
How does Ghost Call protect you? In short... we don't! Ghost Call believes only one thing should be trusted, the things you can see, for this we use Linphone. Linphone is open source, which means the software can be peer reviewed by anyone, at anytime. Ghost Call does the call setup, your presence is managed by Ghost Call, of course TOR exits support TLS SIP, so use TOR if you don't want your public IP exposed to Ghost Call.
Ghost Call recommends ZRTP media encryption. ZRTP media encryption allows for both Diffie Hellman key exchange and audible key matching, this verifies that your call is encrypted from end to end! Linphone doesn't support ZRTP hash, this is a feature! ZRTP hash allows a MITM (Man In The Middle) and creates a risk of decryption, because the SIP proxy is actually in the trust chain. This means if ZRTP hash was allowed, you could be spied on! Read More on ZRTP