AT&T System 25 - Manual (Page 378)

APPENDIX E: Administration Codes and Data
Table E-AH. Automatic Route Selection Administration (Menu=11)
(Contd)
ACTION DESCRIPTlON DATA
900 N11 CO exchange for which a pattern [N11 code]
is being assigned (where N=2-8)
901 ARS pattern number to route these [1-8 or O if this
N11 calls N11 Code must
be followed by
4 other digits
(N11 -XXXX)]
E-59