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Comment: container for all ASM and SBA pages under Best Practices

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Understanding the SBA Concept

A Survivable Branch Appliance (SBA) is a device that increases the resiliency of branch office communications during network failures because it is able to switch Lync VoIP calls from the network over to the PSTN. Sonus offers this functionality for Lync and Skype for Business within the 

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 using an The Application Solution Module (ASM) module is a separate, fully-functional server installed inside the Sonus SBC 1000/2000 chassis. The ASM can host a variety of applications that support the Sonus SBC 1000/2000 system.

If purchased with the Sonus SBC 1000/2000, the ASM module is factory installed and typically comes pre-loaded with the Lync Survivable Branch Appliance (SBA).

that hosts the Microsoft SBA component.


Microsoft proscribed the functionality and security model for the SBA. Sonus is responsible for the method used to reach the Microsoft recommendation.


The Sonus ASM operates in either of two modes:

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

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

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