36 CFR Part 1194 - Proposed Information and Communication Technology (ICT) Standards and Guidelines NPRM - Preamble

4. Coverage of Real-Time Text

As noted previously, the existing 508 Standards and 255 Guidelines were promulgated nearly fifteen years ago. At that time, TTYs were the most commonly available text-based system for communicating within a voice communication system. Since then, technology has greatly advanced to the point where, in addition to TTYs, multiple text-based means of communication are available in the marketplace. One such emerging means of communication is real-time text technology. RTT technology provides the ability to communicate using text messages that are transmitted in near real-time as each character is typed, rather than as a block of text after the entire message is completed. RTT is important as an equivalent alternative to voice communications for persons who are deaf, or who have limited hearing or speech impairments. It allows the recipient to read the sender’s text as soon as it is entered, thus making RTT more conversational and interactive, in a manner similar to a telephone conversation. This also makes RTT particularly useful in an emergency situation when speed and accuracy of a message—or even a partial message—are critical.²

The Advisory Committee examined real-time text technology and recommended that the Board update the 508 Standards and 255 Guidelines to include specifications for RTT. More specifically, the Advisory Committee recommended that, when hardware or software provides real-time voice conversation functionality, it must provide at least one means of RTT communication. See TEITAC Report, Part 6, Subpt. C, Rec. 6-A. With respect to interoperability (i.e., operating outside a closed network), the Committee had two recommendations. First, the Advisory Committee recommended use of the TIA 825-A (Baudot) standard when ICT interfaces with the publicly switched telephone network (PSTN). Second, when ICT interoperated with VoIP products or systems using Session Initiation Protocol (SIP), the Advisory Committee did not recommend a specific standard, noting that there were several possible standards at that time (April 2008), such as RFC 4103, TIA 1001, and MSRP (RFC 4975). Id.

In keeping with the Advisory Committee’s recommendation, the Board proposed in the 2010 ANPRM, to require ICT providing real-time voice communication to support RTT functionality. The Board also proposed prescriptive standards for RTT (e.g., transmission delay, error rates), as well as interoperability requirements. For interoperability with PSTN, the Board proposed (as did the Advisory Committee) use of the TIA 825-A (Baudot) standard. For ICT interoperating with VoIP products or systems using SIP, the Board did not propose a specific standard; instead, the Board proposed that such products or systems support transmission of RTT conforming to a “commonly used cross-manufacturer, non-proprietary standard.” The Board considered referencing RFC 4103, but elected not to do so because, at that time, it was not thought to be a referenceable standard.

Commenters responding to the RTT-related proposals in the 2010 ANPRM generally supported RTT, but offered mixed views on the Board’s proposed technical specifications. Commenters representing people with disabilities strongly supported inclusion of RTT functionality requirements in the proposed rule. They emphasized, among other things, that RTT represented a major advance by allowing persons with hearing- or speech-related disabilities to communicate through real-time text on mainstream devices, rather than having to use special and expensive devices (such as TTYs). They were critical, however, of the Board’s decision not to incorporate a specific VoIP-related interoperability standard. Commenters representing people with disabilities (and also academia) urged the Board to adopt RFC 4103 for RTT interoperating with VoIP using SIP, and provided information to support its use as a referenceable standard. Commenters from industry, on the other hand, encouraged the Board to take a cautious approach to RTT. They believed that, while RTT technology held promise as a major improvement in text communication (particularly in emergency situations), it was not sufficiently mature at that time to warrant adoption of a particular interoperability standard—including RFC 4103—for Internet-based calls. Commenters also objected to the proposed character and transmission delay rates as being overly prescriptive, thus potentially restricting the development of future technologies. (No commenters took issue with the Board’s proposal to incorporate TIA 825-A as the standard for interoperability with PSTN.)

Based on these comments, in the 2011 ANPRM, the Board proposed to retain the references to the TIA 825-A standard for TTY signals on the PSTN, and to add a requirement for conformance with the RFC 4103 standard for VoIP products or systems using SIP. We did not retain the provisions specifying character and transmission delay rates. Overall, commenters largely supported the Board’s revisions to RTT-related requirements in the 2011 ANPRM. However, several commenters representing industry and a local government agency asserted that RTT was not sufficiently mature or deployed widely enough to be useful. Some commenters also identified other standards aside from RFC 4103 that were currently in use (e.g., XMPP and XEP-0301) and could serve to facilitate RTT for Internet-based calls.

In this NPRM, the Board proposes to require that, where ICT provides real-time, two-way voice communication, such ICT must also support RTT functionality. Proposed 410.6 would require features capable of text generation to be compatible with real-time voice communication used on a network. ICT would be required to interoperate either within its own closed system or outside a network. For example, a closed communication system, such as within a federal agency, would be required to interoperate with either the publicly switched telephone network (PSTN) or Voice over Internet Protocol (VoIP) products or systems to support the transmission of real-time text. The Board believes that RTT is sufficiently mature as a technology (and has sufficiently proliferated in the current ICT marketplace) to warrant coverage in the proposed rule. For example, real-time instant messaging programs—such as Yahoo!®Messenger and AOL Instant Messenger’s “Real-Time IM” —have, in the past, used proprietary protocols that were very similar to SIP.

Where federal agencies provide their employees with smartphones or similar technology, this NPRM would require such ICT to have the potential to communicate using RTT. The Board does not, however, thereby intend to require that all phone users (with or without disabilities) communicate using RTT in all circumstances. Similar to several other proposed accessibility features in the proposed rule, RTT must only be enabled and used when needed to ensure comparable access and use of ICT by persons with hearing disabilities. For example, federal managers will need to make clear that, when deaf or hard-of-hearing employees with agency-provided smartphones use RTT, coworkers without disabilities using agency smartphones will also need the RTT feature on their respective phones enabled. Such an approach ensures that communications among deaf and hearing coworkers are equally effective as voice conversations among employees who do not have hearing impairments. Employees who do not need to communicate using RTT would otherwise be able to disable or ignore this feature.

The Board does not suggest that other forms of electronic communication—text or email, for example—would not be used by deaf employees and their colleagues. However, RTT offers many of the same benefits as voice communication. For example, a deaf attorney may need to seek the advice of his supervisor or colleagues during a break in a sensitive negotiation. Given the urgency and time-sensitive nature of the communications between employees, the deaf employee may request that his colleagues make themselves available during the negotiation by enabling RTT on their phones.

The Board did not consider proposing that agencies be permitted to provide RTT-enabled phones to employees only upon request. We did not consider this approach for two significant reasons. First, making accessible ICT available only upon request would run counter to Section 508’s basic premise that information and data must be accessible to all employees without special treatment or the necessity for individualized treatment. Permitting issuance of RTT-enabled smartphones only when requested or deemed needed would be no different than permitting agencies to procure inaccessible ICT, such as a copy machine, where they have not identified a need for the accessible features among current staff. Second, while a proposal permitting agencies to issue non-RTT smartphones absent a special request for RTT features might modestly reduce an agency’s ICT costs (to the extent, if any, that the purchase cost of RTT-enabled smartphones exceeds the cost of smartphones without this feature) and allow agencies to take user preferences regarding RTT into account, such an alternative would erode the proposed rule’s benefits because employees with disabilities who need RTT would not be able to communicate with coworkers who are using government-issued, non-RTT smartphones.

Question 1. To realize the full potential benefits of the Section 508 proposal to require RTT functionality wherever an ICT product provides real-time, two-way voice communication, federal managers would need to direct their employees to keep the RTT features on their phones enabled when needed to accommodate employees with disabilities who use RTT, and federal employees would need to follow such directives. How would keeping RTT enabled on an “as needed” basis affect federal employees’ use of texting? For example, would it cause them to substitute texting with other methods of communication? How can the Board analyze and quantify such effects?

Question 2. The benefits of the RTT proposal under Section 255 are dependent upon the extent RTT features would be enabled and used by the public. The public would not be required to use or keep the RTT features on their phones enabled. Is there available information regarding the extent the public would use RTT features if they were available on their phones? Would use of RTT be different for people with and without disabilities?

In terms of RTT standards, the Board is proposing to require that ICT interoperating with VoIP products using SIP must support the transmission of RTT that conforms to RFC 4103 (RTP Payload for Text Conversion (2005)). In the Major Issues section, the Board also seeks comment on whether additional standards for real-time text, which are in the process of being finalized (such as XEP-0301), should be referenced. See Section V.D, Question 8. We discuss RTT-related issues in further detail below in Section V.D (Major Issues – Real-Time Text), and Section VI.D (Section-by-Section Analysis – Technical Requirements and Functional Performance Criteria – section 410.6).