for alcatel vendor, the access failure are due to abis satellite (and not “might be due”)
for other vendors, i don’t know.
it is due to delay : the 1st channel request is answered by an immediate assigmnment from the BTS, but in the meanwhile the MS has already requested a 2nd channel request.
The 1st Channel Req is answered (no ffailure), but the second is NOT answered –> failure
for other vendor i don’t know how it works, possibly they will not “count” this kind of failures, even if they occur.