Ofcom has formally launched an investigation into BT following a UK-wide disruption to emergency call services last month.

Its rules require BT and other providers to take all necessary measures to ensure uninterrupted access to emergency organisations as part of any call services offered.

They also require providers to take all necessary measures to ensure the fullest possible availability of calls and internet in the event of catastrophic network breakdown or in cases of force majeure.

Separately, providers are required to take appropriate and proportionate measures to identify and reduce the risks of, and prepare for the occurrence of, anything that compromises the availability, performance or functionality of their network or service.

Providers are also required to take appropriate and proportionate measures to prevent adverse effects arising from any such compromise. Where there is an adverse effect on the network or service, the provider must take appropriate and proportionate measures to remedy or mitigate that effect.

Ofcom says its investigation will seek to establish the facts surrounding the incident and examine whether there are reasonable grounds to believe that BT has failed to comply with its regulatory obligations.

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