CHAPTER16 Services
Mediant 800 Gateway & E-SBC | User's Manual
● LDAP query is successful but call fails (due to, for example, busy line) to all the relevant
attribute destinations (private, Skype for Business, PBX, and mobile), and a relevant Tel-
to-IP Release Reason (see Alternative Routing for Tel-to-IP Calls) or SBC Alternative
Routing Reason (see Configuring SIP Response Codes for Alternative Routing Reasons)
has been configured.
Once the device receives the original incoming call, the first rule that it uses is Rule 6, which
queries the AD server. When the AD replies, the device searches the table, from the first rule down,
for the matching destination phone prefix (i.e., "PRIVATE:, "PBX:", "OCS:", "MOBILE:", and
"LDAP_ERR:"), and then sends the call to the appropriate destination.
Querying the AD for Calling Name
The device can retrieve the calling name (display name) from an LDAP-compliant server (for
example, Microsoft Active Directory / AD) for Tel-to-IP calls that are received without a calling
name.
The device uses the calling number (PBX or mobile number) for the LDAP query. Upon an incoming
INVITE, the device queries the AD based on the Calling Number search key (tries to match the
calling number with the appropriate "telephoneNumber" or "mobile" number AD attribute entry). It
then searches for the corresponding calling name attribute, configured by the MSLDAPDis-
playNameAttributeName parameter (e.g., “displayName”). The device uses the resultant calling
name as the display name parameter in the SIP From header of the outgoing INVITE message.
To configure this feature, the following keywords are used in the Calling Name Manipulation for Tel-
to-IP Calls table for the 'Prefix/Suffix to Add' fields, which can be combined with other characters:
■ "$LDAP-PBX": LDAP query using the MSLDAPPBXAttrName parameter as the search key
■ "$LDAP-MOBILE": LDAP query using MSLDAPMobileAttrName parameter as the search key
If the source (calling) number of the Tel- to- IP call matches the PBX / MOBILE (e.g.,
"telephoneNumber" and "mobile") number in the AD server, the device uses the resultant Display
Name instead of the keyword(s).
For example, assume the following configuration in the Calling Name Manipulation for Tel-to-IP
Calls table:
■ 'Source Phone Pattern' field is set to "4".
■ 'Prefix to Add' field is set to "$LDAP-PBX Office".
If the calling number is 4046 and the resultant LDAP query display name is "John Doe", the device
sends the INVITE message with the following From header:
From: John Doe <sip:4064@company.com>
● The Calling Name Manipulation for Tel-to-IP Calls table uses the numbers before
manipulation, as inputs.
● The LDAP query uses the calling number after source number manipulation, as the
search key value.
● This feature is applicable only to the Gateway application.
Least Cost Routing
This section describes the device's Least Cost Routing (LCR) feature.
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