With VoIP and cloud communications being fast developed and widely used, enterprises are able to deploy the telephone solution based on distributed PBX communications or cloud/hosted communications networks at a lower cost. To prevent the interruption of calling and call-related services when the headquarters server or cloud/hosted server disconnects, the New Rock local survivability branch exchange (爱游戏appBX) is designed to be deployed at local offices or branches to handle the calls instead of the disconnected server. After the connection recovers, the calling services will be switched to the headquarters server or cloud/hosted server again. New Rock MA50-爱游戏app provides local voice access through FXO interfaces (2-8) and SIP user registration (50-200), enterprises can choose according to their needs.