diff --git a/library/RAW_NS.ttcnpp b/library/RAW_NS.ttcnpp
index c8fc518..81836c7 100644
--- a/library/RAW_NS.ttcnpp
+++ b/library/RAW_NS.ttcnpp
@@ -257,4 +257,13 @@
 		}
 }
 
+/* Receive a NS-BLOCK and ACK it */
+public altstep as_rx_ns_block_ack(boolean oneshot := false, integer idx := 0, template NsCause cause := *, template Nsvci nsvci := *) runs on RAW_NS_CT {
+	var PDU_NS ns_rf;
+	[] NSCP[idx].receive(tr_NS_BLOCK(cause, nsvci)) -> value ns_rf {
+		NSCP[idx].send(ts_NS_BLOCK_ACK(oct2int(ns_rf.pDU_NS_Block.nS_VCI.nS_VCI)));
+		if (not oneshot) { repeat; }
+		}
+}
+
 }