WxmMike

Potential budget end solution - Raspberry Pi Pico with Pi Hut clock - £30 tops. + Blank rack plate to mount it on. Can run using NTP or free running.

Firstly, thanks to all for prompt and varied responses. In reply to various points raised; 1. We intend retaining one analogue trunk line - currently connected to the alarm system for dial-out, and the box office credit card machine. 2. A wired telephone will also be left plugged in, in the box office, as the first emergency option in the event of VOIP outage (from any cause). 3. This configuration should suffice until 2025 when BT pull the plug on the POTS technology, by which time no doubt other alternatives will become available. 4. The VOIP project already includes UPS(s) covering server, router, managed switches and FTTP ONT - but autonomy period currently around 15 mins. 5. Mobile phones are also available - local mast is a component of government emergency network - resilient design with power backup etc - obviously still subject to usage overload at times ! Based on the above, we are reasonably assured we are meeting our obligations even in the absence of specific licensing or legal direction. Thanks again.

Our theatre currently has an old analogue phone system(POTS) with an inbuilt 3hr battery backup.This will be shortly replaced with a VOIP system running on a local server with VOIP desk phones fed (PoE) from managed switches. Trying to find out if there is a legal / theatre licence requirement to provide battery backup to ensure continuity of service in the event of mains supply failure. BT no longer provide BBU on their domestic fibre VOIP installations, but are theatres subject to other rules / regulations ? Local authority licence application makes no reference at all to telecomms. The site is adjacent to a mobile mast covering two of the mobile operators, with excellent signal, so contingency plan could be use of a mobile in case of emergency. Any advice / comment welcome