本技术报告（TR）描述了运营商之间通过互联网协议（IP）提供电传打字机（TTY）服务的方式？通过使用全球文本电话（GTT）功能来实现网络，该功能允许同时使用文本媒体流进行音频和/或视频传输。

This Technical Report (TR) describes the means that the Teletypewriter (TTY) service can be provided over Internet Protocol (IP) between operators? networks through the use of the Global Text Telephony (GTT) capability which enables simultaneous audio and/or video with text media stream.