
Following widely reported outages impacting O2's 4G network in the UK and Softbank's mobile network across central Japan, Ericsson issued an urgent bulletin attributing the issue to two specific software versions of the SGSN–MME (Serving GPRS Support Node – Mobility Management Entity).
The main issue was an expired certificate in these software versions. Ericsson said a complete and comprehensive root cause analysis is still in progress.
Ericsson...