I have a customer who purchased a Mitel Cordless Accessory module for their 5330 phones. It was a used part and did not include the jumper for the 4 pin sock on the 5330 board. I can not find anywhere that sells them, but I can get correct unpinned plugs. Does anyone know which pins need to be shorted?

Holding the connector so the pins are visible, short the two on the right end.