Customers who connect to centralized IP Centrex services, as well as branch offices of enterprises, using a centralized IP-PBX server, may face a survivability challenge. Stand Alone Survivability (SAS), supported in the Mediant 600, uses SIP B2BUA (Back to Back User Agent) functionality. It provides backup for SIP clients, such as IP and Soft Phones, in case connectivity with the centralized SIP server is lost.
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