ACC is a two-part feature. In order for ACC to function properly it must be implemented in the originating and terminating nodes of an interconnected network. The first part enables a (terminating) network node to alert interconnected nodes that it is in Machine Congestion 1 or 2 (MC1 or MC2. ) The second part allows a distant (originating) network node to automatically react to an ACC message and enact trunk group controls (CANT and SKIP) on specific trunk groups.