When transferring an inbound call internally the number that is displayed is determined by the type of transfer made. This article will explain how to transfer so that the external caller's number is displayed to the transfer recipient.
Virtual Office Desktop
To display the inbound caller's number you will need to Direct Transfer the call internally (see video here https://www.youtube.com/watch?v=nLNW2v8RmOo).
Note: If you want to speak to the transfer recipient before passing the call but still want the inbound caller's number to be displayed you will need to call the transfer recipient first then disconnect their call and Direct Transfer.