asterisk users - Sep 2003 - Incomming call management

Hi all,

I'm looking for the following functionality: if my queues reach a
certain threshold, I would like to disable any available zap / PRI
channels, so my telco doesn't try to connect more people. After a while,
I will enable them again.

Any hints on how to implement this? Should I be looking to patch * on
chan_zap level, or should I somehow ioctl zapata and disable these
channels somehow?

Best regards,

PauloHM