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
This is Helen Hu from China Skyline which in the field of VoIP products, GSM Modem, sim bank and wifi phone. And also deal in routes .Urgent need non cli 92 pak direct route who has voip gateway .