Encrypt all the things! This has been a popular sentiment in the open source community for the last few years. And with the rise of Lets Encrypt this has never been easier and cheaper to do.
One industry that hasn’t been so quick to adopt these new secure mentalities are wholesale VoIP providers. But this is changing and providers like Simwood, Voxbone, DIDLogic and Twilio now offer encrypted voice calls using SIP over TLS with SRTP media.