The Enhanced Access Security Gateway (EASG) system is a key element in protecting passwords and preventing unauthorized use of maintenance and administration login. EASG provides a secure method for Avaya support personnel to access Avaya SBC remotely. Access is under the control of the customer. EASG is a 128–bit AES encrypted challenge-response mechanism for authentication. With this mechanism, Avaya SBC can maintain secure access for services, administration, and maintenance. On Avaya Enterprise Communications System (ECS) products, Avaya services personnel use the EASG challenge and corresponding response for a single access attempt only. After each login, EASG uses a new challenge and response .