The flag DHPAR=DTMFST allows to analog devices and DTMFCTRD=YES allows to digital/functional devices the capability to receive dual tone multi-frequency signals received from the through-connected partner. In other words, the digit sender party will be able to compose DTMF signals for the receiving party, when the receiving party requires the DTMF signaling.

The AMO SCSU, DIAL=DTMF functionality remains the same.