this seems like a physical failure from the looks. (hardware, cabling....)
it could be a configuration error but i've never seen this type of isdn debug output with the typical configuration errors. (could be telco issue at their switch but haven't see this output from a telco idsn issue either)
clearly there is a problem with the router being able to allocate a B channel.
i see you get a TEI assigned. do you ever see MultiFrame Established? (show isdn status)
what version IOS?
please post your configuration if possible so we can see if anything wrong there.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
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