Concerning practical implementation, the VoIP gateways have proven to be the best. Many companies are successfully using the IP telephony thanks to its two main characteristics
Decrease in international and long distance call cost expenditures
Stable communications between company’s offices throughout different cities and counties
TalkFree provides VoIP products to make high quality, low cost communications around the world. Our products support PC, Landline, ATA, and a wide variety of Mobile phones including Nokia, iPhone, and Android