For this year, small businesses will pay only 20% of the value of the VU-M to large operators. In 2016, they'll pay 25%, and at 2017 35%. The difference gradually increases until it reaches 50% in 2019.
This change in percentage was necessary due to the fall of the interconnection rate.
Source: http://www.telesintese.com.br/anatel-faz-mudanca-na-remuneracao-de-rede-celular/