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人为因素(HF).双工通用语音和测试文本(DUST)通信(版本1.2.1)

Human Factors (HF); Duplex Universal Speech and Text (DUST) communications (V1.2.1)

人因工程 (HF); 中继服务的要求

Human Factors (HF); Requirements for relay services

人为因素（HF） 协调中继服务

Human Factors (HF); Harmonized relay services

人为因素（HF）；中继服务要求（V2.1.1）

Human Factors (HF); Requirements for relay services (V2.1.1)

人为因素（HF） 文本电话 基本用户要求和建议

Human Factors (HF); Text Telephony; Basic user requirements and recommendations

人为因素（HF） 文本电话电信中继服务指南

Human Factors (HF); Guidelines for Telecommunication Relay Services for Text Telephones

人为因素(HF).文本电话的通信中继业务指南(版本1.1.1)

Human Factors (HF); Guidelines for Telecommunication Relay Services for Text Telephones (V1.1.1)

人为因素（HF） 基于 IP 的文本电话 已在斯堪的纳维亚半岛（以及其他一些国家）部署

Human Factors (HF); IP-based text telephony - as deployed in Scandinavia (and in some other countries)

人为因素 (HF) 一种基于 IP 的文本电话解决方案 称为“可靠 RTT”

Human Factors (HF); An IP-based text telephony solution known as "Reliable RTT"

人为因素（HF）；基于 IP 的文本电话解决方案，称为“可靠 RTT”（V1.2.1）

Human Factors (HF); An IP-based text telephony solution known as "Reliable RTT" (V1.2.1)

人为因素（HF） 电信中继服务

Human Factors (HF); Telecommunications relay services

人为因素(HF).通信中继业务(版本1.1.1)

Human Factors (HF); Telecommunications relay services (V1.1.1)