It depends on whether or not it's a USB or Bluetooth headset.
For Bluetooth, you need to link it via the "Manage Bluetooth Devices" menu under Accessories on the XMB. Each device has its own linking procedure, so you'll need to read the instructions for your headset. After it's linked, go to Accessories, then Audio Device Settings. Go to Input Device, and click/scroll until you find yours (if it's not already shown). Same for Output Device. .
For USB's, plug it in, restart (or start), then go to Accessories, then Audio Device Settings. Go to Input Device, and click/scroll until you find yours (if it's not already shown). Same for Output Device.
Set your mike level to 4 or 5, then click OK to save.
If you've already got your mike setup via BT link and it's still not working, you'll need to make sure the proper ports are open/triggered for the PS3 and PSN. If you're not sure, follow the link to my long post on the subject at the PS3 Forums. For MW2, there are specific ports that need to be added a well, and they're different from COD4/5. Settings are:
ROUTER NAT AND UPnP MODES - ENABLED
*Note: Make sure to enable these TCP/UDP ports in BOTH directions (i.e, for Routers that have TCP, UDP, and Both for settings, set them to Both. If your Router doesn't have that type of setting, set the Port to either TCP or UDP as indicated, and enable the pass-through in both directions (full duplex))
TCP Ports: 10070 - 10080 UDP Ports: 10070 Voice Chat: UDP 6000-7000, 10070 (for headset operation) Remote Play via Access Point: TCP 9293
PLAYSTATION Network: TCP Ports: 80, 443, 5223 UDP Ports: 3478, 3479, 3658
Call of Duty - MW2 Router Ports
TCP 27014-27050 UDP 1500, 3005, 3101, 27000-27030, 28960
No they are different games
no black ops and conduit 2 are the only games that support it
it does on ps3
There is a microphone headset in stores where you can get games. But that is all i know because i don't have COD6, but i know there is a headset.
Modern warfare reflex and modern warfare are the same. Modern warfare "reflex" means that its for wii. If its just modern warfare its for the other consoles
No
Modern warfare 2
System link is when you connect your and somebody else's console and play a match
modern warfare 2 is better .
Call of Duty Modern Warfare 2
modern warfare 2
Modern Warfare 2