diff --git a/libs/freetdm/src/ozmod/ozmod_libpri/ozmod_libpri.c b/libs/freetdm/src/ozmod/ozmod_libpri/ozmod_libpri.c
index 3af38e389a..4334f597ce 100644
--- a/libs/freetdm/src/ozmod/ozmod_libpri/ozmod_libpri.c
+++ b/libs/freetdm/src/ozmod/ozmod_libpri/ozmod_libpri.c
@@ -878,6 +878,7 @@ static __inline__ void check_events(zap_span_t *span)
 	case ZAP_FAIL:
 		{
 			zap_log(ZAP_LOG_DEBUG, "Event Failure! %d\n", zap_running());
+			zap_sleep(5000);
 		}
 		break;
 	default:
@@ -947,6 +948,7 @@ static int on_dchan_up(lpwrap_pri_t *spri, lpwrap_pri_event_t event_type, pri_ev
 	if (!zap_test_flag(spri, LPWRAP_PRI_READY)) {
 		zap_log(ZAP_LOG_INFO, "Span %d D-Chan UP!\n", spri->span->span_id);
 		zap_set_flag(spri, LPWRAP_PRI_READY);
+		zap_set_state_all(spri->span, ZAP_CHANNEL_STATE_RESTART);
 	}
 
 	return 0;
@@ -965,6 +967,8 @@ static int on_dchan_down(lpwrap_pri_t *spri, lpwrap_pri_event_t event_type, pri_
 	if (zap_test_flag(spri, LPWRAP_PRI_READY)) {
 		zap_log(ZAP_LOG_INFO, "Span %d D-Chan DOWN!\n", spri->span->span_id);
 		zap_clear_flag(spri, LPWRAP_PRI_READY);
+		zap_set_state_all(spri->span, ZAP_CHANNEL_STATE_RESTART);
+		
 	}
 
 	return 0;
diff --git a/libs/freetdm/src/ozmod/ozmod_zt/ozmod_zt.c b/libs/freetdm/src/ozmod/ozmod_zt/ozmod_zt.c
index 7a4de2ad93..085370b76e 100644
--- a/libs/freetdm/src/ozmod/ozmod_zt/ozmod_zt.c
+++ b/libs/freetdm/src/ozmod/ozmod_zt/ozmod_zt.c
@@ -1055,10 +1055,11 @@ static ZIO_READ_FUNCTION(zt_read)
 	zap_ssize_t r = 0;
 	int errs = 0;
 
-	while (errs++ < 300) {
+	while (errs++ < 30) {
 		if ((r = read(zchan->sockfd, data, *datalen)) > 0) {
 			break;
 		}
+		zap_sleep(10);
 		if (r == 0) {
 			errs--;
 		}
@@ -1070,6 +1071,11 @@ static ZIO_READ_FUNCTION(zt_read)
 			*datalen -= 2;
 		}
 		return ZAP_SUCCESS;
+	} else {
+		if (zchan->type == ZAP_CHAN_TYPE_DQ921) {
+			unsigned char buf[25] = {0};
+			write(zchan->sockfd, buf, sizeof(buf));
+		}
 	}
 
 	return r == 0 ? ZAP_TIMEOUT : ZAP_FAIL;