scope:

The present document establishes user interface guidelines for RTT conference call interfaces and identifies technical support needed to implement the guidelines. The present document:

• introduces RTT;

• addresses the types of media and user interface elements that can be associated with RTT;

• describes some RTT use cases, highlights issues particularly relevant in multiparty scenarios;

• explains technical support issues related to text creation and presentation, and the standards and related services associated with RTT transport and control.

The final and crucial part of the present document proposes some potential changes and additions to EN 301 549 [i.13] to ensure that it covers the additional accessibility issues that arise when considering multiparty scenarios.