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Not many people know about this. It's not been posted before so I thought I would post it. Don't forget to thank!
1st your going to need your buddy in your party. after that's done tell him to back out. Invite him. Then wait about 4-6 seconds and go to cage match. If you done this right, In about a moment you should be in cage match with your friend. It depends how much time your buddy takes to accept invite. If it doesn't work then just keep doing it. It wil eventually work. This is a GREAT way to boost with riot shield.
This works with PS3 and XBOX 360, Not sure for PC...
Happy Boosting

^
BY THE WAY THIS IS MOSTLY FOR PEOPLE WHO'S ROUTER ISNT SO GOOD PLEASE DON'T REPLY THAT YOU CAN JUST DO JOIN SESSION BECAUSE IT DOESN'T ALWAYS WORK
Update: This is still working since December 16, 2009