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Understanding the SBA and the ASM


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A Microsoft Survivable Branch Appliance (SBA) is a device that increases the resiliency of branch office communications during network failures because it is able to switch Microsoft VoIP calls from the network over to the PSTN.

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offers this functionality for Skype for Business and Office 365 Direct Routing within the
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 using an Application Solution Module (ASM) that hosts the Microsoft SBA component.

Microsoft prescribed the functionality and security model for the SBA. 

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is responsible for the method used to reach the Microsoft recommendation.

The

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ASM operates in either of two modes:

  • In Appliance mode, the SBA utilizes
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    's solution to guarantee security and reliability.
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    fully supports the ASM (Hardware and Software).
  • In Server mode, the SBA is customized by the customer with a solution not tested or approved by
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    . Customization can be for functionality or security purposes.
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    does not know the impact of this customization, therefore can only support the Hardware components.

By default, all ASMs are shipped in Appliance mode. Any customization you undertake will turn the ASM into Server mode. The only way to return to Appliance mode is to re-initialize the ASM using the on-board capability via the WebUI.

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