dvbapi listen_port not working/saved properly

Using r11230. Config-DVBAPI:

• selected Boxtype dreambox
• selected PMT Mode 4

When entering a value at "Listen port", after a restart of oscam this value is always reset to 0 and tcp connection does not work. It seems that when selecting Boxtype to "PC" that is works good. Thread here: http://www.streamboard.tv/wbb2/thread.php?postid=561724#post561724