UPDATE:
I finally sorted it out.
I used one of the script - Yealink XML Phonebook.xml auto-generation
I was able to generate the xml files. However, I have to move the scripts and xml file to /tftpboot directory. For the reason that Fanvil only support TFTP protocol for provisioning.
The URL on the phone is tftp://192.168.110.252/Phone.xml. Thank you for all your support.
However, I have a new challenge. My Client wants to add employee`s cell number to the directory. Where can I add that on the PBX and how do I update the script to include cell number.
Thank you for your support once again