I am not sure it is going to help but what you are looking for is maybe:
 
Network1
|
Bridge1
|
PPP
|
ISDN
|
PPP
|
Bridge2
|
Network2
 
I think the way to move ethernet frame in PPP is standard by RFC.
But I don't know if Linux PPP stuff implement that (they do IP and maybe IPX/AppleTalk on PPP),
but I don't know about "bridging" on PPP.
 
Another option is to replace PPP by FrameRelay.
But you might be even less lucky in Linux.
 
Whatever ISDN B channel give you a layer 1,
you need a layer 2 (like PPP or FrameRelay)
before you can move your frame accross.
 
David GLAUDE

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