This read-write string specifies the SVC address used to forward a busy hunt group A call over an ACT SDM-FP switched virtual circuit, but only takes effect if sysHuntForwardingAUnit is left empty. An administrator uses this to route hunt group A overflow over an on-demand SVC connection instead of a unit name or fixed PVC. For example, leaving the unit name field blank and populating this SVC address instead would direct busy group A calls dynamically over a switched circuit rather than a dedicated permanent one.