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When WAN is down need to route via PSTN
I am working on an Avaya S8700 Media Server pair and Avaya Modular Messaging at a central site, and an Avaya G350 Media Gateway with S8300 Media Server Local Survivable Processor (LSP) at a branch site. The Avaya S8700 Media Server controls the G350 Media Gateway across a data WAN. Is there any way the Voicemail to the Modular Messaging can be routed via PSTN when the WAN is down? They have IDSN/PRI at both locations.
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