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About this Page

  • This document details how to configure the SBC for Active Directory-based call routing.
  • This document explains how the SBC handles AD caching and repetative AD lookups.


Requires Sonus SBC1000/2000 Version 2.2 or later

This document assumes the user has a working knowledge of the SBC and its WebUI.

This document assumes the user has a working knowledge of Microsoft's Active Directory



Below is the call diagram example used as a configuration reference for the remainder of this document.

Figure : Call Diagram Example






PSTN call arrives at SBC. SBC processes corresponding SG, Call Route & Transformation Table


Call Route/Transformation Table queries the AD cache. The called number is checked against all msRTCSIP-Line records per the Input portion of the transformation entry.


James' msRTCSIP-Line entry matches the called number, +15105743501. James' mobile number is returned from the AD cache. A call is placed to James' mobile, +14085551212.


All of James' AD records are recorded into a record set. This record set is used for all subsequent AD queries for this call.


In forking the call to Lync, the next Call Route entry/Transformation Table is executed. The record set (not the AD cache) is searched to see if the called number matches the msRTCSIP-Line. This type of check is performed simply to ascertain if the called number belongs to a Lync user. If it matches, the same number that was searched is returned and the call request is forwarded to the Lync Server.


The Lync Server processes the INVITE, sending it out to James' Lync client


Before Beginning...

Before beginning the AD configuration, investigate and answer the following:

  • The FQDN/IP of the Domain Controller
  • What AD attribute will be used as key to retrieve records? msRTCSIP-Line, name, or mail are common AD attribute to set as the LDAP search criteria.
  • What area of the Active Directory should be searched?

Figure : ADSI Edit

    ADSIedit showing a typical location for an AD search

  • Does the SBC have a license for Active Directory?

Figure : Current Licenses



Active Directory is part of the SBC base license. The latest base licenses are available at Sonus Download Center.


SBC Active Directory Reference

The following diagrams depict the SBC's Active Directory settings for:

  • Configuring a Domain Controller
  • Setting the Configuration parameters the SBC will use to interoperate with the domain controller

Figure : Configuration for Individual Domain Controllers

Figure : Global Configuration for SBC-to-DC Interactions


SBC AD Configuration

The SBC must be configured for:

  • Active Directory Integration
  • Forked Calling
  • AD-based Call Routing

Active Directory Integration for Call Routing

  1. Click the Settings tab in the top nagivation, then select Domain Controllersin the left-hand navigation

    Figure : Domain Controllers

  2. Enter the AD information for your network

    Figure : Enter AD Information

  3. Click Configurationin the left-hand navigation.

    Figure : Configuration

  4. Configure the Active Directory Configuration as shown. Add whatever Cache Attributesyou plan to use.

    The minimum configuration for this example document should include the attributes: msRTCSIP-Line, name, displayName, mail, telephoneNumber

    Figure : Active Directory Configuration


Active Directory Verification

  1. With the AD configuration completed, click Refresh Cache.

    Figure : Refresh Cache

  2. Click Display Statisticsand verify that the AD queries are succeeding.

    Figure : Display Statistics

  3. In the Domain Controller configuration, check the DC Status

    Figure : Domain Controllers Table


    Figure : Domain Controller Status



  4. Select the Tasks tab in the top navigation and click Active Directory Cache Query. In the form, pick an AD attribute from the pulldown and supply a corresponding value.

    Figure : Active Directory Cache Query

    Queries of the msRTCSIP-Line must match precisely what appears in the Lync Line URI for the desired user, unless Normalized Cache is configured to True. If the cache is normalized, the tel: will be removed from the Lync User Line URI.

SBC AD-based Call Routing

Use the following instructions to create Call Routes and Transformation Tables that perform the call routing noted detail in the Summary section diagram.

1. Create a transformation table with an entry to search for a msRTCSIP-Line entry that matches the called number and returns the mobile number.

Figure : Calls to Mobile



2. Create a new call route table, then a call route entry to the table. In the example, the Calls to Mobile transformation table (above) is added to the call route (below).

Figure : Create Call Route Table



3. Create a second transformation table with an entry to search for a msRTCSIP-Line entry that matches the called number.

Figure : Create Transformation Table




4. Add a second entry to your Call Route table to send the call to the Lync Server. As before, add the transformation table above to the call route below.

Figure : Add Entry



5. Your call route table should look like this:

Figure : Completed Table



  If you are planning to employ AD lookups for Lync Line URI (msRTCSIP-Line), your searches will likely require additional number translations. Click here to view some common number normalizations for msRTCSIP-Line AD lookups.

It is often necessary to change (normalize) a number before performing an AD lookup. The vast majority of lookups require just the addition of +countrycode (i.e. +1 for the US) for a number that is already 10 digits (areacode+number).

The Lync Line URI (msRTCSIP-Line) is different as it is always prepended with tel: and often postpended with ;ext=number. Since AD searches must be exact matches, the number must be corrected before the search. Below are some common normalization transformations.

If Normalize Cache is configured to True, the tel: will automatically be removed from msRTCSIP-Line before the SBC caches the number. Setting Normalize Cache to True is recommended.


If your Lync Line URI: looks like this:



Figure : Lync Line URI



These are two common normalizations:

Figure : Normalize Cache set to True



Figure : Normalize Cache set to False




If your Lync Line URI: looks like this:

Figure : Lync Line URI


These are two common normalizations for a 4 digit extension:


Figure : Normalize Cache set to True



Figure : Normalize Cache set to False




If your Operating Mode is configured to Online, normalization should always include tel: as Normalize Cache is not available in Online mode. As stated before, Online mode is not recommended.


Additional Notes

The diagram below provides a pictorial representation for conceptualizing how data is processed through Transformation Table entries.

Figure : Data Process



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