diff --git a/libs/freetdm/src/zap_isdn.c b/libs/freetdm/src/zap_isdn.c
index af4f89d41f..800627d6a2 100644
--- a/libs/freetdm/src/zap_isdn.c
+++ b/libs/freetdm/src/zap_isdn.c
@@ -88,29 +88,38 @@ static L3INT zap_isdn_931_34(void *pvt, L2UCHAR *msg, L2INT mlen)
 				if (zchan) {
 					switch (changestatus->NewStatus) {
 					case 0: /* change status to "in service" */
-						zap_clear_flag_locked(zchan, ZAP_CHANNEL_SUSPENDED);
-						zap_log(ZAP_LOG_DEBUG, "Channel %d:%d in service\n", zchan->span_id, zchan->chan_id);
-						switch(zchan->state) {
-						case ZAP_CHANNEL_STATE_UP:
-						case ZAP_CHANNEL_STATE_IDLE:
-							zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_TERMINATING);
-							break;
-						case ZAP_CHANNEL_STATE_DOWN:
-							break;
-						default:
-							zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_DOWN);
-							break;
+						{
+							zap_clear_flag_locked(zchan, ZAP_CHANNEL_SUSPENDED);
+							zap_log(ZAP_LOG_DEBUG, "Channel %d:%d in service\n", zchan->span_id, zchan->chan_id);
+							switch(zchan->state) {
+							case ZAP_CHANNEL_STATE_UP:
+							case ZAP_CHANNEL_STATE_IDLE:
+								zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_TERMINATING);
+								break;
+							case ZAP_CHANNEL_STATE_DOWN:
+								break;
+							default:
+								zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_DOWN);
+								break;
+							}
 						}
-					case 1: /* change status to "maintenance" */
-						zap_set_flag_locked(zchan, ZAP_CHANNEL_SUSPENDED);
-						zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_SUSPENDED);
 						break;
-					case 2: /* change status to "out of service" */
-						zap_set_flag_locked(zchan, ZAP_CHANNEL_SUSPENDED);
-						zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_SUSPENDED);
+					case 1: 
+						{ /* change status to "maintenance" */
+							zap_set_flag_locked(zchan, ZAP_CHANNEL_SUSPENDED);
+							zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_SUSPENDED);
+						}
+						break;
+					case 2:
+						{ /* change status to "out of service" */
+							zap_set_flag_locked(zchan, ZAP_CHANNEL_SUSPENDED);
+							zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_SUSPENDED);
+						}
 						break;
 					default: /* unknown */
-						break;
+						{
+							break;
+						}
 					}
 				}
 			}