Experts with SMC Barricade?

Got one and it's working great except for Gamespy. Gamespy lists which ports need to be opened for it to work and I've added those in. However my router wants something called a Trigger Port and I can't seem to find that information anyhow - not on the gamespy forums, help section, etc. I've tried putting in the various ports Gamespy needs into the Trigger Port section to no avail. Any other ideas? Gamespy works fine when I'm using DMZ but I'd prefer not to use that if possible.

tks,

Ty