N.M. Code R. § 17.11.28.20
No ICSP may prohibit or prevent completion of a collect calling call or decline to establish or otherwise degrade collect calling solely for the reason that it lacks a billing relationship with the called party's communications service provider unless the ICSP offers debit calling, prepaid calling, or prepaid collect calling.
[17.11.28.20 NMAC - N, 11/7/2023]