User's Manual 272 Document #: LTRT-10532
Mediant 500L Gateway & E-SBC
Note: For Enterprises implementing a PBX / IP PBX system, but yet to migrate to
Skype for Business, if the PBX / IP PBX system is unavailable or has failed, the
device uses the AD query result for the user’s mobile phone number, routing the call
through the PSTN to the mobile destination.
The flowchart below summarizes the device's process for querying the AD and routing the
call based on the query results:
Figure 15-40: Querying AD in Skype for Business Environment
Note: If you are using the device's local LDAP cache, see ''Configuring the Device's
LDAP Cache'' on page 260 for the LDAP query process.
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