RE: DTMF bounce?

I figured out how to fix the problem. I'm not quite sure I understand why; but it works; if the channel is offhook (this is a B8ZS/D4 wink-start T1), the bounce issues go away entirely. Is there any way this could be investigated as a possible software bug? The software in no way treats the DTMF processing routine any differently when a channel is on-hook.

For whatever it's worth, this is a Linux system running the latest system release.