Supplement 70 to ITU-T Q-series Recommendations (06/2019) - Signalling requirements for IMS and GSM/UMTS network supporting multi-device emergency telecommunications service Summary History FOREWORD Table of Contents 1 Scope 2 References 3 Definitions 3.1 Terms defined elsewhere 3.2 Terms defined in this Supplement 4 Abbreviations and acronyms 5 Conventions 6 General aspects of multi-device services 6.1 Description of the multi-device service 6.2 Scenarios of multi-device service 7 General requirements of multi-device ETS 8 Signalling requirements for IMS and GSM/UMTS network 8.1 CS connected multi-device emergency call anchored to IMS 8.1.1 Signalling procedures for multi-device emergency calls 8.1.2 Signalling requirements for multi-device emergency calls 8.2 IMS connected multi-device emergency call 8.2.1 Signalling procedures for multi-device emergency call 8.2.2 Signalling requirements for multi-device emergency call Bibliography