diff --git a/ChangeLog b/ChangeLog
index 3043199b..e9032d53 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -4811,7 +4811,9 @@ v0.33.20        10-Feb-2002
 		Removed some debug logging.
 		Creates the semafore is_inet when the internet connections is
 		available, and removes it when it is down.
-		Added test for ISDN/modem lines in use.
+		Added test for ISDN/modem lines in use. If a line status 
+		change lasted 5 seconds or longer, the oubound will be
+		rescanned.
 		Lots of code cleanup.
 		No setup setting anymore for maximum POTS and ISDN lines, this
 		is now automatic.
diff --git a/mbtask/ports.c b/mbtask/ports.c
index 8c57d0fe..21feceea 100644
--- a/mbtask/ports.c
+++ b/mbtask/ports.c
@@ -183,11 +183,12 @@ void check_ports(void)
 	if ((lf = fopen(lckname, "r")) == NULL) {
 	    if (tpl->locked) {
 		tpl->locked = 0;
-		tasklog('+', "Port %s is now free", tpl->tty);
-		/*
-		 * Good, set master rescan flag
-		 */
-		changed = TRUE;
+		tasklog('+', "Port %s is now free after %d seconds", tpl->tty, tpl->locktime);
+		if (tpl->locktime > 4)
+		    /*
+		     * Good, set master rescan flag if longer then 4 seconds locked.
+		     */
+		    changed = TRUE;
 	    }
 	} else {
 	    fscanf(lf, "%d", &tmppid);
@@ -200,8 +201,17 @@ void check_ports(void)
 	    } else {
 		if (!tpl->locked) {
 		    tpl->locked = rempid;
+		    tpl->locktime = 0;
 		    tasklog('+', "Port %s locked, pid %d", tpl->tty, rempid);
-		    changed = TRUE;
+		} else {
+		    /*
+		     * Count locktime
+		     */
+		    tpl->locktime++;
+		    if (tpl->locktime == 5) {
+			changed = TRUE;
+			tasklog('+', "Port %s locked for 5 seconds, forcing scan", tpl->tty);
+		    }
 		}
 	    }
 	}
diff --git a/mbtask/ports.h b/mbtask/ports.h
index 84b62233..1bb5ed8c 100644
--- a/mbtask/ports.h
+++ b/mbtask/ports.h
@@ -14,6 +14,7 @@ typedef struct _pp_list {
     unsigned long   mflags;	/* Analogue modem flags		*/
     unsigned long   dflags;	/* ISDN flags			*/
     int		    locked;	/* If port is locked		*/
+    long	    locktime;	/* Time it is locked		*/
 } pp_list;