If my understanding is correct, these days it seems that many ISDN BRI lines
are configured in energy saving mode in which signalling D-channel is
“dropped” until a new call comes in.
Is it possible to replicate this behaviour with Asterisk (when Asterisk is
in NT mode and is seen as a public ISDN by another PBX, for instance) ?
If not, would you it would be a useful addition to Asterisk ?