MSCRM 2013 New Phone Number Format

In the December 2012 Service Update, Phone Format was added for a number of telephone number fields on OOB entities. Most phone number fields in the OOB entities were also migrated as part of the release, but some fields, such as Fax number, did not get the Phone format.

In CRM 2013, this format with the label Phone Number is being added to the list of available formats in the attribute editor.
Fields with this format type enable a click-to-call experience for your telephony provider such as Lync or Skype.