Teleport will work inside or out. But you can only teleport to a dungeon portal from within that same dungeon; and to a wilderness one from that same wildeness area. A good rule of thumb is that you can always teleport to a portal that is placed at a spot on the map that you can see from where you are currently standing while viewing the map (with the exception of those few places where teleport is set up to fail - I won't say where
). Call of Home only works outside.
Jon