The last afternoon I wasted many hours on this inter-connection !
I had to connect a brand new Avaya Nortel BCM 450 to Cisco 2821 in the ISDN/E1 plug. After several tests I found that it is not possible to use a standard cable of any type.
I had googled and found the post in linkografia, with success: below is the complete pin-connection.
T1 Crossover Cable from Chris’ CCVP Weblog