---
kind: "section"
citation: "47 C.F.R. § 67.1"
title: "47"
number: "67.1"
heading: "Definitions."
url: "https://uscodex.org/cfr/47/67.1"
---

# §67.1. Definitions.

- (a) Authorized end user device means a handset or other end user device that is authorized by the provider of a covered service for use with that service and is able to send, receive, and display text.
- (b) CMRS provider means a CMRS provider as defined in [§ 20.18(c)](/cfr/47/20.18.md?p=c) of this chapter.
- (c) Covered service means a service that meets accessibility requirements by supporting RTT pursuant to part [6](/cfr/47/part6.md), [7](/cfr/47/part7.md), 14, 20, or 64 of this chapter.
- (d) RFC 4103 means IETF's Request for Comments (RFC) 4103 (incorporated by reference, see [§ 67.3](/cfr/47/67.3.md) of this part).
- (e) RFC 4103-conforming service or user device means a covered service or authorized end user device that enables initiation, sending, transmission, reception, and display of RTT communications in conformity with RFC 4103.
- (f) RFC 4103-TTY gateway means a gateway that is able to reliably and accurately transcode communications between (1) RFC 4103-conforming services and devices and (2) circuit-switched networks that support communications between TTYs.
- (g) **Real-time text (RTT)—** or RTT communications means text communications that are transmitted over Internet Protocol (IP) networks immediately as they are created, e.g., on a character-by-character basis.
- (h) **Support RTT—** or support RTT communications means to enable users to initiate, send, transmit, receive, and display RTT communications in accordance with the applicable provisions of this part.

## Notes

### Authority

Authority: 47 U.S.C. 151-154, 225, 251, 255, 301, 303, 307, 309, 316, 615c, 616, 617.

### Source

Source: 82 FR 7707, Jan. 23, 2017, unless otherwise noted.