DaveA

For a very simple way, for example,
if the user has a SC set e.g.
SC ?
Number .
Feature : Busy

to create the call barring, add another SC such as

SC 12345N
Number: N
Feature: Dial

then anyone who knows the prefix 12345 (or something more suitable) would be able to dial out.
Maybe worth a try.
Cheers

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