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
Wholesale SIP/IAX Origination and Termination. Flat rate and per-minute Canadian and U.S. DIDs, Virtual PRI,Canada, USA and A-Z International Termination. Commission based agent programs and white label VoIP solutions.