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.
Telefone através de VOIP para todo o mundo a baixo custo. Fale para telemóvel em Portugal por 3,25 cêntimos. Também com soluções e tarifários para empresas