AudioCodes E-SBC User Manual page 271

CHAPTER 16 Services
6. The device adds unique prefix keywords to the query results in order to identify the query type
(i.e., IP domain). These prefixes are used as the prefix destination number value in the Tel-to-
IP Routing table to denote the IP domains:
● "PRIVATE" (PRIVATE:<private_number>): used to match a routing rule based on query
results of the private number (MSLDAPPrivateNumAttributeName)
● "OCS" (OCS:<Skype for Business_number>): used to match a routing rule based on
query results of the Skype for Business client number (MSLDAPOCSNumAttributeName)
● "PBX" (PBX:<PBX_number>): used to match a routing rule based on query results of the
PBX / IP PBX number (MSLDAPPBXNumAttributeName)
● "MOBILE" (MOBILE:<mobile_number>): used to match a routing rule based on query
results of the mobile number (MSLDAPMobileNumAttributeName)
● "LDAP_ERR": used to match a routing rule based on a failed query result when no
attribute is found in the AD
These prefixes are involved only in the routing and manipulation processes; they are not
used as the final destination number.
7. The device uses the Tel-to-IP Routing table to route the call based on the LDAP query result.
The device routes the call according to the following priority:
a. Private line: If the query is done for the private attribute and it's found, the device routes
the call according to this attribute.
b. Mediation Server SIP address (Skype for Business): If the private attribute does not
exist or is not queried, the device routes the call to the Mediation Server (which then routes
the call to the Skype for Business client).
c. PBX / IP PBX: If the Skype for Business client is not found in the AD, it routes the call to
the PBX / IP PBX.
d. Mobile number: If the Skype for Business client (or Mediation Server) is unavailable
(e.g., SIP response 404 "Not Found" upon INVITE sent to Skype for Business client), and
the PBX / IP PBX is also unavailable, the device routes the call to the user's mobile
number (if exists in the AD).
e. Alternative route: If the call routing to all the above fails (e.g., due to unavailable
destination - call busy), the device can route the call to an alternative destination if an
alternative routing rule is configured.
f. "Redundant" route: If the query failed (i.e., no attribute found in the AD), the device uses
the routing rule matching the "LDAP_ERR" prefix destination number value.
For digital interfaces (Gateway application): 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:
Mediant 1000 Gateway & E-SBC | User's Manual
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