extremly often "No circuit/channel available" error on E1 port
I have one 5300 as voice gateway with one E1 on controller 0. Everything seems to be fine (sh isd status, sh controler e1 0, sh trunk group, ...), but over 90% calls fail with "Cause i = 0x82A2 - No circuit/channel available" message (debug isdn q931).
I tested channels one by one, and all of them worked.
I have no idea whatsoever, what could be the problem?!?
E1 is obviously working fine, since all channels work, IP link is OK, I can hear the test call clearly, but real traffic fails.
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