The answers that I can give now are.
It is a extern modem/router an connected to open internet with a fixed ip address.
My connection is running, by my isp, over the Tiscali network and therefore my modem has the Tiscali configurations. The firmware is a little different then the standard ZyXEL type.
Copy out of modem/router:
System Name: adsl-modem
ZyNOS F/W Version: V3.40(MS.7)b3-2 | 6/02/2006
DSL FW Version:TI AR7 06.00.04.00
Standard:ADSL2+ Mode
For the a User’s Guide I was all ready looking but because of the different types in this modem/router it is not easy to find.
Because off new rules in Europe about toxic materials this type has change looks.
P-2602R Series is the closets look off it and maybe you can look in that User’s Guide.
The question about a STUN server setup I don’t understand. Sorry.