Section 64.630 - Applicability of change of default TRS provider rules(a) Sections 64.630 through 64.636 governing changes in default TRS providers shall apply to any provider of IP Relay or VRS eligible to receive payments from the TRS Fund.(b) For purposes of §§ 64.630 through 64.636 , the term iTRS users is defined as any individual that has been assigned a ten-digit NANP number from the TRS Numbering Directory for IP Relay, VRS, or point-to-point video service.82 FR 17764, Apr. 13, 2017 82 FR 17764, 5/15/2017; 82 FR 48203, 10/17/2017