Accepting credit cards by phone using DTMF masking

Hi all,

Have any of you researched or implemented a contactless way of accepting credit cards by phone, such as DTMF masking? The concept is to provide a way to accept credit cards via phone without staff ever hearing or handling the cardholder data. Here are two links that provide more details:

https://semafone.com/blog/dtmf-masking-used-payment-processing/
https://www.pcipal.com/en/solutions/agent-assist/

Thanks!

David