From his deep knowledge of the subject, Steve, a retired Senior Systems Engineer for the Metropolitan Police Service gave a history of calls for help from the earliest times, before electricity, up to the very latest innovations in digital communications.
It was strange to hear the early police didn’t really want communications with the public other than face to face meetings. The onset of communications by electronic means brought improvements in general communications which the police could no longer ignore.
After the end of the second world war, mobile radio began to play an important part, When the mobile phones arrived 1986, it was apparent that an overall control of communications was required which lead to the development of Terrestrial Trunked Radio known as TETRA.
Modern emergencies such as terrorist activities, large rallies and events like the Kings Cross fire begin to show shortcomings and engineers are now looking to the most modern
of digital techniques such as MCPTT over 4G, (Mission-critical push to talk over the 4G phone network to include high availability and reliability, low latency with support for group calls and
one to one calls with caller ID, including device to device direct comms for emergency calling.)