STAND-ALONE SURVIVABILITY (SAS) APPLICATION

The device's Stand-Alone Survivability (SAS) feature ensures telephony communication continuity (survivability) for enterprises using hosted IP services (such as IP Centrex) or IP-PBX in cases of failure of these entities. In case of failure of the IP Centrex, IP-PBX servers (or even WAN connection and access Internet modem), the enterprise typically loses its internal telephony service at any branch, between its offices, and with the external environment. Typically, these failures also lead to the inability to make emergency calls. Despite these possible points of failure, the device's SAS feature ensures that the enterprise's telephony services are maintained, by routing calls to the PSTN.