# Transferring non-DTMF RFC 2833 events

Applications can send any DTMF, line, and trunk events specified in RFC 2833 by sending the MSP_CMD_ENCODE_PLAY_RFC2833 command to the voice encoder filter.

This command specifies RFC 2833 line or trunk event and its duration. The voice encoder filter sends this information in RFC 2833 compliant RTP packets. When using this command, applications send a structure containing the following fields:

Field | Type | Description
event | WORD | RFC 2833 event (0 - 255) to include within the packet payload. Refer to the RFC 2833 specification for information about available options.
duration | WORD | Duration of the RFC 2833 event, in milliseconds.