(Recasts to add details on Oi plan, Brazil's regulatory issues, BTG Pactual, share and bond performance)
(Adds that company believes human error caused outage, analyst comments on cause and impact of outage)
(Rewrites throughout, adding details on mobile business from filing, analyst quotes)
MILAN, Aug 27 - A legal adviser for Telecom Italia said a move by Brazil's biggest fixed-line firm Oi signalling it may make an offer for Tim Brasil seemed just a spoiling tactic.
No related earnings announcements are currently scheduled within the next 7 days.