There is a sample searchable directory that returns users and h323 dialing information at: https://videnet.unc.edu/vide-dod/
This is a web-based application that searches an underlying LDAP server that uses commObject. You can see how the commURI is used to link the user to an endpoint. You can also see how the label in commURI is used to allow users to create a friendly 'Endpoint Name' for their endpoint. This also demonstrates how endpoints can be associated with users (like 'John') or resources (like 'Conference Room 212').
Try searching for 'Jo' or all users in the United States (this second search will take a little while).
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