NAT

I have the embarq 660 dsl modem (I had the sprint 645 & no problemz at all + the same router..), & linksys wrt54g, and my nat type: type 3. but im trying to play psp, socom fireteam bravo 1. I can get on the game & play just fine but, I cant use the headset, (so I can hear & talk 2 ppl..)
Can any one help me I have tryed alot of thing for 3-6 dayz. 
p.s.-on psp, psp, socom fireteam bravo 2, I can hear & talk in ever room I go in2...

First question is do you know what NAT stands for? It is Network Address Translation. In simple terms, it assigns IP address to your network. Unless you've fooled around the settings should be unchanged.

For the simplest possible solution, try shutting down ALL the equipment. Then boot in this order: the cable/DSL modem, the router, the switch, the Xbox console. Give the modem and router plenty of time (30-40 seconds) before booting the next device.

Come back if this doesn't work.

Jeff