A lot of people on internet has been asking that how to display IP Phone field when we browse the users properties in address book through MS Outlook. Even I was one of them, so I opened many support tickets with MS and finally got success in achieving this task now I will share my steps here:
1. Open Schema Manager using mmc
Note: You need to register schmmgmt.dll, to get this snap-in
Install the Active Directory Schema snap-in
http://technet.microsoft.com/en-us/library/cc755885.aspx
2. Now go to classes folder in the Schema mmc
3. Navigate to the attribute msExchCustomAttributes
4. Go to properties
5. Click on Add
6. Add the attribute "ipphone"
7. Close all windows and come out of the schema mmc
8. Open LDP
9. Make a connection to the Schema Master on port 389
10. Bind to this server with schema administrator credentials
11. Click on Browse menu and select modify
12. Leave the DN blank
13. Add the word schemaUpgradeInProgress
14. Set the value to 1
15. Make sure "add" is selected
16. Click on enter. You will see a new line added now
17. Now click on Run
18. In the LPD you should now see that this was successful
19. You now need to set a MAPIid for this attribute, until which you will not be able to see this attribute in the add list in the user details templates
20. Now open ADSIedit.msc, . Browse to the schema
21. Select a attribute which you think will never be used
22. Eg : Ms-Exch-Extension-attribute-15 (On the right side find Ms-Exch-Extension-attribute-15 (we need to take the mapi value of this) then right click on the attribute and click Properties on the attribute
23. Copy the MapiID value from there and set it to "NotSet"
24. Edit the attribute Phone-IP-Primary
25. Add this copied value of MapiID into this attributes MAPIid
26. Wait for replication
27. Change the user templates as needed now to add this attribute. You should see
this attribute listed when you add an "edit" value. It will be listed as
Phone-IP-Primary.
28. Open LDP. Make a connection to the Schema Master on port 389
29. Bind to this server with schema administrator credentials
30. Click on Browse menu and select modify
32. Leave the DN blank
33. Add the word schemaUpgradeInProgress
34. Set the value to 0
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