From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.3) Gecko/20040922 Description of problem: ISDN support is missing in RHES4 Beta 1. In RHES3 these drivers were in kernel-unsupported. This package does not seem to exist anymore? Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1. try to use ISDN 2. 3. Additional info:
FWIW, here's an e-mail that quotes the explanation of why kernel-unsupported no longer exists as of RHEL 4: https://www.redhat.com/archives/nahant-beta-list/2004-October/msg00006.html (Unfortunately I couldn't find the original mail in the archives, but this post at least quotes the full explanation, so I guess that's good enough.)
This is included in Beta2.
Support appears to be there with 2.6.9-1.669_EL.