external hunt is to send a call on busy to a number outside the switch.. you don't usually need a hunt group (ld 18) to have hunting up the keys on a phone
cls hta
lhk 1
would make line 1 ring if line 0 is called while busy. roll is not a nortel term, hunt for busy, forward no answer for treatment on ring no answer.. each are treated by unique cls marks and rules
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