With 'main access number' you mean the main PSTN number?
in LD 21, PRT, LDN you can view the Listed directory (main) number. If you have an attendant the main number will connect to the M2250.
If no attendant is available the switch will be in 'Night service'. Via LD 21, PRT, NIT you can resolve the destination.
cheers,
Edwin
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