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BS 8521-2:2020

$142.49

Social alarm systems. IP signalling protocols – Specification for NOW-IP

Published By Publication Date Number of Pages
BSI 2020 32
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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:

  1. alarm information;

  2. speech path and system control commands;

  3. selection of local units in grouped equipment;

  4. request for information on outstanding calls;

  5. speech control functions;

  6. equipment control functions;

  7. programming;

    • parameter programming;

    • parameter remote enquiry; and

  8. 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
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
BS 8521-2:2020
$142.49