Introduction

23.2263GPPGlobal Text Telephony (GTT)Release 17Stage 2TS

Real time, character by character text conversation is a component that can be of value in a distant conversation. Users may have an interest to use real time text conversation alone or in any combination with voice and video.

Global Text Telephony is a feature that adds the capability to use a text conversation component in a session. It is called GTT here.

GTT is defined in a set of host environments, circuit switched as well as packet switched.

Interworking with corresponding features in other networks is an important part of Global Text Telephony. Specifically, the different kinds of PSTN text telephone systems supported by the international text telephone modem standard ITU‑T Recommendation V.18 [4] are included in the modes for interworking consideration.

One important reason to offer the Global Text feature is to enable emergency service access to people who are depending on a written dialogue.

A more elaborated background is found in TS 22.226 [3], Global Text Telephony, Stage 1, Annex A.