Boot into WDS from external PXE

Hi there,
in our Company (huge datacenter) we use ONE PXE-Bootmenu for ALL Servers (not managed by me) to boot into different deployment-systems (predominant Linux-Based deployments). Now we want to implement WDS (on Server 2012 R2) to boot into Windows-Deployment-Services.
Now I asked the Team which is managing the DHCP and PXE to add a new Option to the PXE-Bootmenu so we can boot into WDS. On that machine there is ONLY WDS-Service running.
What do they need to setup? Which file must be linked from the PXE-Menu? Which path? Do I have to make any additional settings on WDS?
When I search the web, I can only find infos how I can setup SYSLINUX on a Microsoft WDS, but not how to boot into WDS from an external PXE.
Please can someone help?
Regards
Miranda

I wasn't referring to the setup, but the menu. The menu and config files are the same regardless of what the host OS is. I posted it as a reference to how it is possible to boot WDS from PXELinux, but the specific example is where the WDS is on the same
server.
Chainloading is definately what is needed, but even that iPXE link is chainloading via HTTP (hence my Apache/IIS remark)... I do not know how you can PXE boot a WDS via HTTP.
Windows Server also has a WDSUTIL command that sends out a "browse" option with the PXE Boot request. The result ends up being you can press F11 or F9 instead of F12 and the client machine will search the network for PXE servers. This is how I
currently manage having multiple PXE servers. My default option is to press F12 to do a Legacy PXE boot to the main server, or use F11 if I want to boot to the Linux or UEFI server. See here for that example:
http://www.stephan-schwarz.net/?p=58
If Linux has a similar option, it could be used so you can choose a different PXE server. Otherwise, still have to research how to chainload to an external server, without using HTTP unless someone knows how to PXE boot WDS via HTTP.
EDIT: pxechn.c32 looks promising to add a menu option to chainload to another server:
http://www.syslinux.org/wiki/index.php/Pxechn.c32

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