You need to launch IP Communicator as an Administrator in order to make changes to preferences. Right-click on your IP Communicator launch icon, wait for the menu options, scroll down and select "Run As Administrator."
Hope this helps.
As pointed by others, make sure your IPC is subscribed to the desired services, only Enterprise services show up by default, otherwise services subscribed to the existing phone do not automatically get subscribed to the a new phone.
Or depending on how the phone was configured, you can just add the phone device profile information under preferences and then it will briefly restart and your phone ACD line and DID line if applicable will appear.