This British Standard 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 Recommendation G.711 [1].
The standard specifies an in-call protocol which supports the 300 ms
maximum round trip delay specified in the UK National Transmission
Plan [2] for connections over the fixed network.
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