---
kind: "section"
citation: "47 C.F.R. § 67.2"
title: "47"
number: "67.2"
heading: "Minimum Functionalities of RTT."
url: "https://uscodex.org/cfr/47/67.2"
---

# §67.2. Minimum Functionalities of RTT.

- (a) **RTT-RTT Interoperability.** Covered services and authorized end user devices shall be interoperable with other services and devices that support RTT in accordance with this part. A service or authorized end user device shall be deemed to comply with this [paragraph (a)](#a) if:
  - (1) It is an RFC 4103-conforming end user device;
  - (2) RTT communications between such service or end user device and an RFC 4103-conforming service or end user device are reliably and accurately transcoded—
    - (i) to and from RFC 4103, or
    - (ii) to and from an internetworking protocol mutually agreed-upon with the owner of the network serving the RFC 4103-conforming service or device.
- (b) **RTT-TTY Interoperability.** Covered services and authorized end user devices shall be interoperable with TTYs connected to other networks. Covered services and authorized end user devices shall be deemed to comply with this [paragraph (b)](#b) if communications to and from such TTYs:
  - (1) Pass through an RFC 4103-TTY gateway, or
  - (2) are reliably and accurately transcoded to and from an internetworking protocol mutually agreed-upon with the owner of the network serving the TTY.
- (c) **Features and Capabilities.** Covered services and authorized end user devices shall enable the user to:
  - (1) Initiate and receive RTT calls to and from the same telephone numbers for which voice calls can be initiated and received;
  - (2) transmit and receive RTT communications to and from any 911 public safety answering point (PSAP) in the United States; and
  - (3) send and receive text and voice simultaneously in both directions on the same call using a single device.

## 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.