I had to add the following lines to get any pad connections to go through on the 2620:
x25 profile TELEBAHN dxe
?x25 facility windowsize 10 10
?x25 facility packetsize 1024 1024
?x25 subscribe packetsize permit 32 1024 target 512 1024
?x25 subscribe windowsize permit 1 16 target 2 10
with those lines applied I was finally able to connect to JJ's and I also managed to get an inbound PAD to VTYs setup
-DK