Well....

Nowadays nearly everyone's on some variant of VoIP -anyway- even for fax, while email's nearly universally TLS encrypted in transit from any major mail carrier, so that's kinda switched over the past few years.

#cough

Anyway. My mom does billing info for my uncle's medical-related practice, and let's just say that interception in transit is the least of people's worries when it comes to PII being intercepted when talking to billing folks.