DTMF

Send one character

sendDTMF() accepts 0-9, *, #, and A-D.

callSession.sendDTMF("1");

Send a sequence

sendDTMFs() validates every character and waits after each one. The default delay is 500 milliseconds.

await callSession.sendDTMFs("101#", 500);

This is useful for conference access codes and interactive voice response menus.

Receive DTMF

Use dtmf for decoded characters:

callSession.on("dtmf", (digit) => {
  console.log("DTMF:", digit);
});

Use dtmfPacket only when the underlying telephone-event RTP packet is needed:

callSession.on("dtmfPacket", (packet) => {
  console.log("Telephone-event payload bytes:", packet.payload.length);
});

For a conference dialing example, see demos/join-rcv-meeting.ts.