Question : cisco router isdn graceful shutdown

Hi there,
is there a way to gracefully shutdown an ISDN link . so that if there are active calls going through some of the channels, they get shutdown only once the calls are completed ! Is it if we busy out the isdn first and then shutdown, does that achieve that ?

Answer : cisco router isdn graceful shutdown

It is pretty much all or nothing. On the gateway, shut the pri interface and it is down all the way and will cut all existing calls.