diff --git a/channels/misdn/isdn_lib.c b/channels/misdn/isdn_lib.c
index bb4da69213bee4ab64ba73bad8e4554f7d468274..de922b75c276ee77d982133e7fee26b3e31e45f3 100644
--- a/channels/misdn/isdn_lib.c
+++ b/channels/misdn/isdn_lib.c
@@ -1652,6 +1652,7 @@ handle_event_nt(void *dat, void *arg)
 		case CC_CONNECT|INDICATION:
 		case CC_ALERTING|INDICATION:
 		case CC_PROCEEDING|INDICATION:
+		case CC_SETUP_ACKNOWLEDGE|INDICATION:
 
 		{
 			struct misdn_bchannel *bc=find_bc_by_l3id(stack, hh->dinfo);