ZyXEL Communications P-334WT Support Notes page 96

UPnP Operations
Addressing:
UPnPv1 devices MAY support IPv4, IPv6, or both. For IPv4, each devices should have DHCP client, when the device gets connected to the network,
it will discover DHCP server on network to get an IP address. If not, then Auto-IP mechanism should be supported so that the device can give itself an IP address.
(169.254.0.0/16)
Discovery: Whenever a device is added on the network, it will advertise it's service over the network. Control point can also discover services provided by devices.
Description: Control points can get more detailed service information from devices' description in XML format. The description may include product name, model
name, serial number, vendor ID, and embedded services...etc.
Control: Devices can be manipulated by control points through Control message.
Eventing: Devices can send event message to notify control points if there is any update on services provided.
Presentation: Each device can provide their own control interface by URL link. So that users can go to the device's presentation web page by the URL to control
this device.
2. Use UPnP in ZyXEL devices
In this example, we will introduce how to enable UPnP function in ZyXEL devices. Currently, Microsoft MSN is the most popular application exploiting UPnP, so we take
Microsoft MSN application as an example in this support note. You can learn how MSN benefit from NAT traversal feature in UPnP in this application note.
In the diagram, suppose PC1 and PC2 both sign in MSN server, and they would like to establish a video conference. PC1 is behind PPPoE dial-up router which supports
UPnP. Since the router supports UPnP, we don't need to setup NAT mapping for PC1. As long as we enable UPnP function on the router, PC1 will assign the mapping to
the router dynamically. Note that since PC1 must support UPnP, we presume that it's OS is Microsoft WinME or WinXP.