It is a device capturing and controling all the signals, which are being created by the whole system, especially the made and received phone call signals. The device is mostly used for connecting regular phone system with the Internet and backwards.
0800 Empresarial
0800 Fixo = R$ 0.40
0800 Cel = R$ 1.10
Ligação Locais
Fixo para todo brasil somente R$ 0.08
Internacionais
R$ 0.10