The Answer to your question is yes though it only supports BRI. Above the ethernet port is a blanking plate. If you undo the two thumbnails screws at the back and pull the base unit away for the case you will see there is a daughter board connection under where the blanking plate is.
The ISDN card slots in here. Do not know the part number off the top of my head unfortunatley but can find out for you.
One thing to be aware of is that if configuring from scratch as soon as you configure the ISDN interface you will lose COM1 as an available interface. This is down to the amount of drivers the AN can support and is normal. COM1 will appear grayed out. If Com 1 is already configure and COM2 is free then that wil be greyed out.
I have a weird problem with the AN router with ISDN card.
The ISDN line is up, when the COM 1 is down, but the routing did not work. After I checked, the Flash Card free space is less than 2MB. After moving some old config file, to a PC. I managed to make the Flash Card free space arround 2MB. Then the ISDN routing works fine.
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