Telelink Business Services submitted the sole offer in the procedure for awarding the contract, BULATSA said in a notice.
The contract was inked on September 30, according to the notice.
Telelink Business Services is expected to generate a turnover of some 70 million euro this year, its majority owner - private individual Lubomir Minchev, said earlier this year.
In 2017, Telelink reorganised its business into four new companies - Telelink Business Services, Telelink Infra Services, Telelink City Services and Telelink Labs. The four companies became part of newly established holding group Telelink Bulgaria.
(1 euro = 1.95583 levs)