We use on premise Active Directory, Exchange online, and Skype for Business online. We use the latest version of Azure AD sync.
I am looking for a way to show users' internal phone extensions in Skype for Business. We cannot use the "Telephone number" field from the General tab in AD because this field is being used already to show the users' direct dial external number. I would prefer to use the IP Phone field from AD but I can't find a way to make this show up in SfB. The pager field would be fine also because, let's be honest, who uses those anyway?!?
Can anyone recommend a phone number field that could be used for showing internal extensions in Skype for Business?