Specification for dual-tone multi-frequency (DTMF) signalling protocol for social alarm systems Ingestion-build-264231 BS EN 14399-8 supersedes BS

BS EN 14399-8 supersedes BS EN 14399-8:2007

Related items that are not requirements of this Standard

BS EN ISO 10893‑7:2019 supersedes BS EN ISO 10893‑7:2011

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transmissivity and storage coefficient

Specification for dual-tone multi-frequency (DTMF) signalling protocol for social alarm systems Ingestion-build-264231 BS EN 14399-8 supersedes BSBS 8521: 2009 Specification for dual tone multi frequency (DTMF) signalling protocol for social alarm systems BS 8521 specifies requirements for the transfer of information and controls within a social alarm system, by means of dual tone multi frequency (DTMF) tone signals passing between site control or local equipment and an alarm receiving centre via the public switched telephone network (PSTN) supporting voice traffic conforming to ITU T