# Modifying the RFC 2833 DTMF configuration

Modify the DTMF mode and payload ID in the RFC 2833 DTMF configuration for pass-through channels, and for encoder and decoder channels:

- Modify the DTMF mode and payload ID for a pass-through channel by using h324PassthruDTMFMode.

- Modify the DTMF mode for an encoder or decoder channel by using standard Fusion MSPP Functionality. For more information, see the Fusion Developer's Manual.