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
RocTel International was established in 2002, a wholly owned Irish company with the vision of becoming the best in class service provider to business customers in the Irish and UK marketplace.