SIP User's Manual
606
Document #: LTRT-12804
Mediant 800 MSBG
8.6.2
AD-Based Tel-to-IP Routing in Microsoft OCS 2007 Environment
Typically, enterprises wishing to deploy Microsoft’s Office Communication Server 2007
(OCS 2007) are faced with a complex, call routing dial plan when migrating users from their
existing PBX/IP-PBX to the OCS 2007 platform. As more and more end-users migrate to
the new voice system, dialing plan management and PBX link capacity can be adversely
impacted. Moreover, it’s easy to perceive that even a temporary failure (or disconnection)
of Microsoft’s Office Communications Server 2007 Mediation Server (Mediation Server)
results in no incoming voice calls from the PBX/IP-PBX/PSTN and therefore, it will be
impossible to reach the user on the user’s Microsoft Office Communicator (OC) client.
This feature enables the device to make Tel-to-IP call routing decisions based on
information stored on Microsoft’s Active Directory-based (AD) enterprise directory server.
This implements one common, central database to manage and maintain information
regarding user’s availability, presence, and location.
Based on queries sent to the AD, this feature allows you to route incoming Tel calls to one
of the following IP domains:
PBX/IP-PBX (for users yet to migrate to the OCS 2007 platform)
OCS clients (clients connected to the OCS 2007 platform)
Mobile
The device queries the AD using the destination number. The device's AD queries return
up to three user phone number IP destinations, each pertaining to one of the IP domains
listed above. The device routes the call according to the following priority:
1.
OCS SIP address:
The call is routed to Mediation Server (which then routes the call
to the OCS client).
2.
Mobile number:
If the Mediation Server or OCS client is unavailable (e.g., SIP
response 404 "Not Found" upon INVITE sent to OCS client), the device routes the call
to the user's mobile number (if exists in the AD).
3.
PBX/IP-PBX number:
If no OCS client exits in the AD, then the device routes the call
to the PBX/IP-PBX (if this fails, the call is routed to the mobile number, if exists).
For enterprises implementing a PBX/IP-PBX system but yet to migrate to the OCS 2007
platform, if the PBX/IP-PBX system is unavailable, the device queries the AD for the users
mobile phone number and then routes the call, through the PSTN to the mobile destination.
This feature is configured in the Outbound IP Routing table, where the "LDAP" keywords
are entered for the destination phone prefixes. For each IP domain (listed above), the
destination numbers are prefixed (case-sensitive) as follows:
OCS client number:
"OCS:"
PBX number:
"PBX:"
Mobile number:
"MOBILE:"
LDAP failure:
"LDAP_ERR:"
Note that these prefixes are only involved in the routing and manipulation stages; they are
not used as the final destination number.
In addition, once you have configured the LDAP parameters (see ''LDAP Overview'' on
page
), you need to enter the "LDAP" value for the destination IP address of the LDAP
server in the Outbound IP Routing table.
For enabling alternative routing, you need to enable the alternative routing mechanism and
configure corresponding SIP reasons for alternative routing. For this feature, alternative
routing always starts again from the top of the table (first routing rule entry) and not from
the next row.
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