How to Protect Yourself From Caller ID Spoofing

Security model -
In order to authenticate voice calls and content, authenticall will face adversaries with a range of capabilities.
The simplest adversary will attempt to commit phone fraud by spoofing caller ID when calling a target. An
equivalent form of this attack may occur by the adversary tricking their target to call an arbitrary number
under their control and claiming to represent some other party. Additionally, this adversary may perform a call
forwarding attack, which forces a target calling a legitimate number to be redirected to the adversary. Lastly,
the adversary may place a voice call concurrent with other legitimate phone calls in order to create a race
condition to see which call arrives at the destination first. In all of these cases, the goal of the adversary is to
claim another identity for the purpose of extracting sensitive information.