Switchvox - What settings allow a Digium BRI card to work when a telco lets the spans idle when not in use?

By default, a Digium BRI card will try to bring up Layer 1 when it detects the remote side (the telco) has brought it down.  If your telco requires that you allow it to go down, then you should set the following in the /etc/modprobe.d/dahdi.conf modules initialization file:

Further, you also need to set the /etc/asterisk/chan_dahdi.conf option as follows:

These settings allow your Digium BRI card to work in an environment in which the telco wants to let the spans idle when not in use.