regarding those Establish Failures,
can you put a bit more information, from what you are getting on this two counters
1163/17 and 1163/0 ?
anyway, if t200 expirations are way high, you can try to isolate if there is any trx wich is adding the mayority of them, and seek for hw issues.
on sccp discs, is more complex, it could be from abis issues to bad setting paging parameters.
the alarm is simple and inutil (i think), just said that the listed subchanns were free after X time. ( where X is the hours you have defined on radresfreetimer)