WIP:

debug isdn q931 – see live calling / called numbers on PRI
debug voip ccapi inout – This is hard to read but you will see something on the screen if calls come in / out of the FX0 / POTS lines.
debug ccsip messages – debug sip messages
debug ccsip all – debug all sip traffic – CAREFUL
term mon – see debugs on the screen
u all – disable all debugging