I have seen a scenario that produces results very much like the issue that you describe. The scenario involves configuring a router with dial where dialer profiles are configured. In the configuration there is authentication configured in the dialer profile but not configured on the physical interface (BRI or whatever). Since outgoing calls use the dialer profile where authentication is configured the call can authenticate and the call is successful. But an incoming call rings the physical interface, but since it does not have authentication configured it can not authenticate and the incoming call fails.
So is it possible that the remote access router is configured with dialer profiles, and that the dialer profile has authentication but the physical interface does not have authentication configured?
I am not sure why the remote includes isdn point-to-point-setup in the configuration of the BRI. I have seen some situations where having that in the config did create some problems. I suggest that you remove it and see if the behavior changes.
If the problem still is going on then I would suggest that it might be helpful to do some more testing, trying to make a call from the core while running debug isdn q931 and perhaps debug ppp authentication.
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