AT&T MERLIN LEGEND Communications System Key System Planning Forms Errata Key System Planning page 12

Key System Form 2b
System Numbering — Digital/ISDN Station Adjuncts
Maximum: 127 Adjuncts
MFM
MLX Person, Location,
Factory-Set Telephone Function, and
Extension No. Renumber To SAA T/R 7500B Equipment T pe
Ext. No.
Logical ID Y
1