Here is a sample of XP setting up Port Forward:

—— LOCAL ——
POST /uuid:000625d8-095f-0006-25d8-095f0232aa18/WANIPConnection:1 HTTP/1.1
HOST: 192.168.1.1:5431
CONTENT-LENGTH: 696
CONTENT-TYPE: text/xml; charset=”utf-8″
SOAPACTION: “urn:schemas-upnp-org:service:WANIPConnection:1#AddPortMapping”

<s:Envelope
xmlns:s=”http://schemas.xmlsoap.org/soap/envelope/ ”
s:encodingStyle=”http://schemas.xmlsoap.org/soap/encoding/ “>
<s:Body>
<u:AddPortMapping
xmlns:u=”urn:schemas-upnp-org:service:WANIPConnection:1&#8243;>
<NewRemoteHost></NewRemoteHost>
<NewExternalPort>27360</NewExternalPort>
<NewProtocol>UDP</NewProtocol>
<NewInternalPort>8615</NewInternalPort>
<NewInternalClient>192.168.1.101</NewInternalClient>
<NewEnabled>1</NewEnabled>
<NewPortMappingDescription>msmsgs (192.168.1.101:8615) 27360
UDP</NewPortMappingDescription>
<NewLeaseDuration>0</NewLeaseDuration>
</u:AddPortMapping>
</s:Body>
</s:Envelope>