Carriers will try and tell you that its impossible to have a particular channel of an E1 blocked, and use the reasoning that it is a single circuit with timeslots on that circuit so if one works they all work.
However, i have had the "resource unavailable" message you are getting on E1s ive worked on before in europe, and the carriers level 1 and 2 support both told me everything was ok. I spoke to the level 3 support chap (Eventually!) and he fixed it - the channel was busied out or something.
I didnt, however, notice the status of the timeslot using voice call summary like you have. I think it's worth chatting to your carrier though and asking to discuss it with their technical guys.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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