All, I have not found/seen a resolution to the issue where my TDM400P seems to cause problems, as outlined in the "mISDN (HFC-S) and TDM400P - mISDN: ISAC XDU no TX_BUSY" thread. I have also not found/seen a simple 'how to' on patching DAHDi with ZAPHFC as outlined in the "HFC-S card" thread. Do I have anyother options with ISDN? Thanks in advance!