Cisco IOS 12.x: ppp dial-in via bri0 -> bridge to lan (2611)

Hi,

I don't know how Cisco calls it, so I explain what I want to do:

There is an old Cisco 2611 given with 2 ethernet and 1 bri ISDN interface.

I want to a dial in port (auth by password/username) by ISDN and simply bridge the connection into the lan of the router.

How ist this done? How is this bridging called in cisco terms?

Thanks a lot in advance.

Cheers,

UG