Avaya Enterprise Cloud (AEC) is cloud service provides UC and CC SIP solutions or customers. It provides an alternative for existing Avaya Aura® customers that want to move their existing Avaya Aura® premises service to more a cloud experience while maintaining much of their existing setup and system experience. The subscription service is hosted and managed by Avaya in Azure Data Centers. The AEC Branch Survivability feature provides survivability to remote workers in branches.

This feature is used in a configuration that provides survivability to remote workers in branches. The following diagram shows a setup where a remote worker maintains connectivity to both Session Manager in the core and Session Manager in branches. When core Session Manager is available all connectivity is to core Session Manager through Avaya SBC. When there is a failure, Remote worker will use branch Session Manager and hence survives locally within the branch.

Remote side (Workers): Connections are always initiated from remote workers to Avaya SBC. An external IP is configured on Avaya SBC for each core Session Manager for redundancy configurations.

Remote side (Branches): Connections are always initiated from Branch Session Manager to Avaya SBC and there is a single external IP on Avaya SBC that all Branch Session Managers connect to. A connection established from a Branch Session Manager to a Session Manager is reused for the messages from Session Manager to Branch Session Manager.

Core side: An internal IP is assigned for each Branch Session Manager. In Avaya SBC, each Session Manager is configured with a server for each IP.

When there is a failure between core and branches, Remote Workers detect the failure and uses Branch Session Manager for local survivability. It connects multiple Branch Session Managers to core Session Manager through Avaya SBC using a single external IP. This in turn minimizes cost to customers as external IPs in cloud environment are expensive. Single External IP is the key advantage of this feature.

The SIP trunk connectivity established from Branch Session Manager to Session Manager through Avaya SBC can be used to route calls.