This document specifies minimum requirements for secure connection and session for remote access to one or more alarm systems, for example fire safety systems, intruder and hold-up alarm systems, electronic access control systems, external perimeter security systems, video surveillance systems, and social alarm systems. This document specifies the requirements for the performance, reliability, integrity, and security characteristics of a Remote Access Infrastructure. This document specifies the requirements for a Remote Access Infrastructure between a Remote Access Client and an alarm system at the supervised premises and may be either integrated as part of the ATS or a separate infrastructure. In either case, the requirements of this European technical specification should apply. This document does not cover the provision of functions and features on the alarm system.