Office phone extension attribute and Azure AD

There was an interesting question posted on the O365 community forums: how does the​ “Ext” field visible under “Work Info” for the user in the Azure AD portal ties in with the Office phone attribute? Moreover, it is possible to populate this field from the on-prem AD?

Well, the answer is quite simple: you can use the telephoneNumber AD attribute and append the extension to it using the format: +123456×789 where the fist part will be the actual phone number and the part after ‘x’ will be the extension. Here’s how it looks like in the ADUC console:

122416 1527 Officephone1

And here is how it will look in Azure AD (go to Active Directory -> select the AD in question -> Users -> select the user in question -> Work Info):

122416 1527 Officephone2

Hope this helps!

3 thoughts on “Office phone extension attribute and Azure AD

  1. Marc says:

    is this still applicable? I tried it but the look in Azure AD is different. the box for EXT is not there.

  2. Nate says:

    Try with a space after the number and x. Like +123456 x789

  3. Mag says:

    I changed it in the Attrib. editor from +123456 to +123456×789 and then when checked on the outlook properties it appears same format +123456×789 but Extension is empty


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