Verify Replication of Schema Partition
To verify that the schema extension have been successfully replicated in your Active Directory Domain Services forest, do the following:
Log on to a domain controller (other than the domain controller that holds the schema master role) in your Active Directory Domain Services forest, where the schema extensions were applied as a member of the Enterprise Admins group.
Open ADSI Edit: Click Start, click Administrative Tools, and then click ADSI Edit.
Alternatively, click Start, then click Run, type adsiedit.msc to start ADSI Edit.
In the Microsoft Management Console (MMC) tree, if it is not already selected, click ADSI Edit.
On the Action menu, click Connect to.
In the Connection Settings dialog box under Select a well known Naming Context, select Schema, and then click OK.
Under the schema container, search for CN=ms-RTC-SIP-SchemaVersion. If this object exists, and the value of the rangeUpper attribute is 1150 and the value of the rangeLower attribute is 3, then the schema was successfully updated and replicated. If this object does not exist or if the values of the rangeUpper and rangeLower attributes are not as specified, then the schema was not modified or has not replicated.
If your check of the replication of the schema does not yet show a successful replication, wait approximately 15 minutes and then check again. Active Directory replication is based on a loose consistency model and some replication latency can occur, based on a number of factors in the server and infrastructure.