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
Cloud based Sip provider, Giving acces to voice in the cloud. Cutomer based sip hosting or dedicated hosted sip. Creating backup sip pbx for omnipcx Enterprise 40X8EE sets.