--- a/sip-in/main.c	Wed Sep 28 18:37:19 2022 -0800
+++ b/sip-in/main.c	Wed Sep 28 18:45:16 2022 -0800
@@ -75,15 +75,15 @@
 			exit(1);
 		}
 		gettimeofday(&cur_event_time, 0);
-		if (rc == 0) {
+		if (rc) {
+			if (gsm_is_connected && FD_ISSET(gsm_socket, &fds))
+				gsm_socket_select();
+			if (mgw_is_connected && FD_ISSET(mgw_socket, &fds))
+				mgw_socket_select();
+			if (FD_ISSET(sip_socket, &fds))
+				sip_socket_select();
+		} else if (need_retrans)
 			run_periodic_retrans();
-			continue;
-		}
-		if (gsm_is_connected && FD_ISSET(gsm_socket, &fds))
-			gsm_socket_select();
-		if (mgw_is_connected && FD_ISSET(mgw_socket, &fds))
-			mgw_socket_select();
-		if (FD_ISSET(sip_socket, &fds))
-			sip_socket_select();
+		clear_dead_sip_calls();
 	}
 }