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@X_Ordinary_X the host can try forwarding port 3074 udp (https://www.lifewire.com/how-to-port-forward-4163829)
check you windows settings or sound mixer or bo2 settings in sound if nothing then you need to redownload bo2 here a link to fix it How to repair your game
@XTRA-Ordinary most likely just an unstable internet connection, try again.
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