TAKTALK voice/text chat message (CoT type m-t-t).
Optional
Target TAKTALK chatroom ID from <chatroom-id>.
<chatroom-id>
True when the source CoT carried a push-to-talk marker.
Language tag from <lang> (e.g. "English").
<lang>
"English"
Message body from <text>.
<text>
TAKTALK voice/text chat message (CoT type m-t-t).