Interoperability Profile for Relay User Equipment
draft-ietf-rum-rue-03
rum B. Rosen
Internet-Draft 25 August 2020
Intended status: Standards Track
Expires: 26 February 2021
Interoperability Profile for Relay User Equipment
draft-ietf-rum-rue-03
Abstract
Video Relay Service (VRS) is a term used to describe a method by
which a hearing persons can communicate with deaf/Hard of Hearing
user using an interpreter ("Communications Assistant") connected via
a videophone to the deaf/HoH user and an audio telephone call to the
hearing user. The CA interprets using sign language on the
videophone link and voice on the telephone link. Often the
interpreters may be supplied by a company or agency termed a
"provider" in this document. The provider also provides a video
service that allows users to connect video devices to their service,
and subsequently to CAs and other dead/HoH users. It is desirable
that the videophones used by the deaf/HoH/H-I user conform to a
standard so that any device may be used with any provider and that
video calls direct between deaf/HoH users work. This document
describes the interface between a videophone and a provider.
Status of This Memo
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This Internet-Draft will expire on 26 February 2021.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
Rosen Expires 26 February 2021 [Page 1]
Internet-Draft Relay User Equipment Profile August 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Requirements Language . . . . . . . . . . . . . . . . . . . . 5
4. General Requirements . . . . . . . . . . . . . . . . . . . . 6
5. SIP Signaling . . . . . . . . . . . . . . . . . . . . . . . . 6
5.1. Registration . . . . . . . . . . . . . . . . . . . . . . 6
5.2. Session Establishment . . . . . . . . . . . . . . . . . . 8
5.2.1. Normal Call Origination . . . . . . . . . . . . . . . 8
5.2.2. One-Stage Dial-Around Origination . . . . . . . . . . 9
5.2.3. RUE Contact Information . . . . . . . . . . . . . . . 10
5.2.4. Incoming Calls . . . . . . . . . . . . . . . . . . . 10
5.2.5. Emergency Calls . . . . . . . . . . . . . . . . . . . 11
5.3. Mid Call Signaling . . . . . . . . . . . . . . . . . . . 11
5.4. URI Representation of Phone Numbers . . . . . . . . . . . 12
5.5. Transport . . . . . . . . . . . . . . . . . . . . . . . . 12
6. Media . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.1. SRTP and SRTCP . . . . . . . . . . . . . . . . . . . . . 13
6.2. Text-Based Communication . . . . . . . . . . . . . . . . 13
6.3. Video . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.4. Audio . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.5. DTMF Digits . . . . . . . . . . . . . . . . . . . . . . . 13
6.6. Session Description Protocol . . . . . . . . . . . . . . 13
6.7. Privacy . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.8. Negative Acknowledgment, Packet Loss Indicator, and Full
Intraframe Request Features . . . . . . . . . . . . . . . 14
7. Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.1. CardDAV Login and Synchronization . . . . . . . . . . . . 14
7.2. Contacts Import/Export Service . . . . . . . . . . . . . 15
8. Mail Waiting Indicator (MWI) . . . . . . . . . . . . . . . . 15
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