31924: Stream - Websocket - Protocol Error

Twilio returns this error when your WebSocket server sends a malformed message or otherwise does not follow the WebSocket protocol during a Voice Media Stream.

• The WebSocket control frame was fragmented.
• A message sent by your server did not conform to the WebSocket protocol.
• In a bidirectional Stream, your server sent a message back to Twilio that was not a supported media, mark, or clear message, or the message format was invalid.

• Verify the messages sent by your server.
• If you use bidirectional Media Streams with <Connect><Stream>, send only supported media, mark, and clear messages back to Twilio.
• When sending a media message, encode the payload as base64 audio/x-mulaw audio at 8000 Hz and do not include audio file header bytes.
• If you started a unidirectional Stream with <Start><Stream>, do not send audio or control messages back to Twilio over the WebSocket connection.

• Media Streams overview
• WebSocket messages for Media Streams
• TwiML <Stream> reference