By using the DHCPUtil.exe on the front end server one can emulate a DHCP query and thus test the DHCP configuration.
The command is DHCPUtil.exe -emulateclient
The results are seen in the cmd window as follows:-
Above we see a response from the DHCP server (10.2.24.110).
Notice DHCP SIP Server (Option 120) and Vendor Info (Option 43)