FS-11750: don't shrink NACK table (vbw) so drastically (don't drop a frame with…

FS-11750: don't shrink NACK table (vbw) so drastically (don't drop a frame with every added packet when complete_frames > max_frame_len)

src/switch_jitterbuffer.c

@@ -1251,8 +1251,11 @@ SWITCH_DECLARE(switch_status_t) switch_jb_put_packet(switch_jb_t *jb, switch_rtp
 
 	add_node(jb, packet, len);
 
-	if (switch_test_flag(jb, SJB_QUEUE_ONLY) && jb->complete_frames > jb->max_frame_len) {
-		drop_oldest_frame(jb);
+	if (switch_test_flag(jb, SJB_QUEUE_ONLY) && jb->max_packet_len 
+			&& jb->allocated_nodes > jb->max_frame_len * 2 - 1) {
+		while ((jb->max_frame_len * 2 - jb->visible_nodes) < jb->max_packet_len) {
+			drop_oldest_frame(jb);
+		}
 	}
 
 	switch_mutex_unlock(jb->mutex);