Overview: Mediant 800B SBA is an essential element for multi-site deployments of Skype for Business and is fully certified by Microsoft. the device provides branch office voice resiliency, by ensuring continued access to Skype for Business services including voice and data communications, during Wide Area Network (WAN) failure scenarios where loss of connectivity occurs with the datacenter (typically at the Enterprise's headquarters). During survivability, the device maintains local call connectivity among Microsoft users located at the branch site (Skype for Business clients and devices such as IP phones). It can also provide call connectivity between the branch site users and the PSTN (E1/T1 Trunk) during a WAN failure, if PSTN interfaces are ordered with the device. Specification: General Information