BS 8521-2:2020
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Social alarm systems. IP signalling protocols – Specification for NOW-IP
Published By | Publication Date | Number of Pages |
BSI | 2020 | 32 |
This British Standard specifies requirements for the transfer of information and control signals between social alarm equipment used in specialized group living environments and alarm receiving centres (ARCs).
It provides for the establishment of a common signalling protocol over a public or private IP network to ensure that social alarm systems from different manufacturers exchange essential information and controls in a compatible manner.
This British Standard specifies a protocol for point-to-point transmission of alarms, faults, control signals and communications monitoring using the Internet Protocol (IP) to enable communication of the following:
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alarm information;
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speech path and system control commands;
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selection of local units in grouped equipment;
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request for information on outstanding calls;
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speech control functions;
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equipment control functions;
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programming;
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parameter programming;
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parameter remote enquiry; and
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streaming media, e.g. voice.
NOTE 1 The alarm protocol is intended for use over any network that supports the transmission of IP data with sufficient quality of service to support VoIP.
NOTE 2 The alarm protocol is defined as an XML scheme including the alarm types, codes and necessary additional information.
The alarm protocol is an application layer protocol using another IP as a transport protocol to handle addressing and transport functions. The transport protocol initially defined in this standard is Session Initiation Protocol (SIP).
PDF Catalog
PDF Pages | PDF Title |
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4 | Foreword |
5 | Introduction 1 Scope |
6 | 2 Normative references 3 Terms, definitions and abbreviations |
8 | 4 Alarm and status messages 4.1 General requirements 4.2 Alarm transmission message format |
9 | Table 1 — Configuration system type Table 2 — Speech link type Table 3 — Three-digit codes for alarm events |
11 | Table 4 — Location code assignments |
12 | Table 5 — Priority code assignments Table 6 — Status code assignments |
13 | 4.3 System configuration assignment 4.4 System type assignments 4.5 Event code assignments 4.6 Location code assignments 4.7 Priority code assignments 4.8 Status code assignments 4.9 Speech path and system control commands 4.10 Speech control functions |
14 | 4.11 Equipment control functions Table 7 — Equipment control functions |
15 | 4.12 Programming |
17 | Table 8 — Parameter programming number |
19 | 4.13 Parameter remote enquiry 5 Suitability of Session Initiation Protocol (SIP) and SIMPLE |
20 | 5.1 Security 5.2 Implementation of BS 8521 alarm signalling over IP transport |
21 | Table 9 — Transmission messages |
22 | Table 10 — Message format |
23 | Figure 1 — Alarm with media stream Figure 2 — Alarm without audio |
25 | Table 11 — Transmission messages |
28 | Table 12 — Programming data element |
29 | Bibliography |