The DME server and the DME database are installed into a DMZ section of the company network.
Firewall rules are set up to allow inbound traffic (seen from the perspective of the DME server) for the phones, the DME Administration interface, any connectors that will be set up, and communication with the DME AppBox Gateway. The server and the database can be installed on separate physical servers, using MS Windows or several flavors of Linux as operating system.
The DME server manages all aspects of the DME solution that are the same across all connectors: statistics, device management, logging, and provisioning. Furthermore, it is used to manage the connectors themselves.