Establish a system in the back end that automatically pauses phone call recording when credit card information is spoke aloud to prevent recorded calls from including credit card info. You could utilize an active listening system that listens for keywords then pauses recording.

Being a service provider for phones that work with EHR's and medical practices, having the ability to automate pausing call recording when taking payment information over the phone will be indispensable with PCI compliance and your customers.