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
Founded in 1988, Citilink Group is today one of the leading lights in the Nigerian business community. It is a multi-investment company with interests in communications, information technology, finance, travels and tours, and consultancy.