A similar sticker with the hardware version and firmware version is also stuck on the bottom of the router itself.
When I plug the ATA into the modem, all calls are successful. Andy Log into D-Link site and upgrade router firmware, if a newer version is available. I managed to resolve the problem by updating the firmware on the router. When disabling ALG, the PAP2T couldn't register at all. 3.11NA from 23, Jun, 2009), although it won't let me upgrade the firmware.
You can tell which Rev of the hardware this router is from the box (it will say "H/W Ver: B1 F/W Ver 2.00" for example on the bottom of the box, underneath the barcode.
"H/W Ver.: B5 F/W Ver.: 2.10" is not supported and does not work. A similar sticker with the hardware version and firmware version is also stuck on the bottom of the router itself.
I have read that they are identical even using the same PCB (and not changing the numbers on it either) but I don't know if they have different firmware.
I've heard that they are interchangeable but I can't find out what I'm doing wrong to install DD-WRT on my router.