I think you shuld give each tech a 2nd dn similar to the original one. Say your external number plan is 12000-12999
Say Tech1 has 12011 as his personal DN, assign KEY 0 as 88011 and KEY 1 as 12011. i.e leave only 3 last digits.
That way incoming external calls cant call KEY 0 (88011) and for...
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