Use LD 12 to add the attendant alternate number (AADN) to the console programming.
Then in LD 15 change the ATT data block to include a value for ATIM (Attendant Alternate Timer). Four rings is about 16-20 seconds.
If you need to print our the existing configuration (and I highly advise it), use LD 20 for the 2250 console and LD 21 for the ATT_DATA block.
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