This attribute indicates the maximum number of Frame Relay (FR)
calls of any type (PVC, SPVC, or SVC) which can be
simultaneously 'current' on the LP. Note that 'current' doesn't
necessarily mean that the call is in data transfer. It minimally means
that such a call can subsequently generate accounting records.
When the value of currentCalls reaches the value of maxCalls for
FR on this LP, subsequent call attempts are rejected by the FR
service.