This read-only counter tracks the number of incoming point-to-point and point-to-multipoint SVC/SPVC call attempts on this interface that failed because insufficient resources were available for the parameters requested by the call. It lets an admin identify inbound call failures caused by capacity exhaustion, such as bandwidth or connection-table limits, rather than routing or filtering. For example, a rise in this counter during peak hours could indicate the interface is running out of bandwidth or VCI capacity for new incoming calls.