HP Survivable Branch Communication zl Module powered by Microsoft Lync Planning and Design Guide 2011-02

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SBM Overview
SBM Role in a Microsoft UC&C Solution
Figure 1-10. Remote PSTN Call
The process for establishing such a call is similar to that for establishing a
local call. However, the remote PSTN gateway takes the place of the SBM’s
gateway.
Survivability
You now have a basic idea of how the SBM handles calls in normal operations.
During a WAN failure, the SBM automatically forwards all calls over its PSTN
connections as shown in Figure 1-11.