J´ai trouver ca sur le site officiel du jeu :
"Community Update - 4/13/06
Friday 14 April 2006
The latest community update on the 360 version of Modern Combat
We are glad you are enjoying Battlefield 2: Modern Combat for the Xbox 360. We are aware that a small percentage of you are experiencing problems with the headset communicator. We are working on a solution for this, which will be released in a patch. In the meantime, a potential workaround is to log out of Xbox Live and then log back in. In addition, we have found that people with the full retail version and the marketplace demo may have issues with cross-game invites. To correct this, just delete the marketplace demo from your Xbox 360, since all of the demo content is contained in the full retail version.
Thanks and stay tuned for further updates.
The team at EA and DICE"