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 1-11. Call Flow During WAN Failure
“Behavior During a WAN Outage” on page 2-30 of Chapter 2: “Design Consid-
erations” provides more information about which services are available in this
situation.
The SBM and data center Lync Servers can also provide redundancy for each
other for different types of failover. For example, the parent central site Front-
End pool is automatically configured as a backup registrar pool for the SBM.
The branch Lync users can register to this pool for the rare case in which the
SBM fails entirely.
Conversely, you can create routes such that the SBM and other sites’ PSTN
gateways provide backup for each other. Thus you maximize your resources
and your resiliency. (For more information, see the Microsoft Lync Server
documentation.)