USA KX-TA308 = Non expandable
Other KX-TA308 = Expandable

Factoids:
-USA KX-TA308 is identical to KX-TA624 'cept there are no connectors on the board where the expansion card would go.

-If you put a KX-TA624 IC into a USA KX-TA308, you can use 7000 and 7700 series phones on it.

-2 port doorphone card from USA KX-TA308 will go in a KX-TA624, providing DOOR1 and DOOR3

-Joe