CardEasy Agent Assist uses DTMF (Dual-tone multi-frequency) masking to allow your customers to make secure PCI DSS compliant payments via their telephone keypads whilst on a call with your agents. If your customers are unable to or don’t want to use their phone keypad, this can also be done by ASR (Automatic Speech Recognition). When using the ASR option the audio of the customer's card details will not be accessible either to the agent or to the call recording.