How to find which channel is ringing

Hi all,

   If use TDM analog cards, how to find which channels are busy or free?
   If use digium digital cards, how to solve it?
   Thank you

I haven’t used TDM cards, but have you tried using ${DEVICE_STATE()}?

If the question really is specific to Digium cards, which I doubt, you should use their commercial product support channels.

Thank you