Same here. I was playing via xbox live, was dumped out of my party's lobby. Error servers currently unavailable. I've dashboarded, bounced my box, and reset my connection entirely. It will not connect. Sometimes it sites error 256 but the majority of the time it gives no error. Tried another game from Activision even, works just fine.
To check the status of online services you can visit Call of Duty®: Ghosts || Game Status .
If online services are fully operationally and you are still experiencing an issue connecting you may want to try the following:
1. Rebooting your router.
2. Use a wired connection to sustain the connection quality.
2. Try connecting directly through the modem. This will help identify if there's an issue with the router or possible blocked ports.
3. Establish a static IP address and port forward to open any blocked ports.
Here are the port numbers you will need:
Xbox 360: Activision Support
PS3: Activision Support
If you have any questions on how to port forward, please contact your ISP or the router manufacturer for further assistance.