To access the directory, click on the DREAM ORG WIDE bookmarks bar folder located in the upper left corner of your Chrome browser.  The PHONE DIRECTORY link will take you to the Directory section your Google Contacts page.

The phone directory is searchable by name and displays extensions only on the main page.  If you wish to look for a person's DID (Direct Inward Dialing) for outside calling then click on their name and a profile card will pop up.  The DID will be shown if they have one associated with their extension as shown in the example below.