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
we are a professional manufacturer of IP phone and camera.we are a real factory so we can provide good quality product with good price.Do you have any interest in our products?pls kindly logo our web www.great-elec.com.