122-11.T.bin should work for you.
after you set up the gateway in cm you will need to add a few commands to the gateway.
1. get rid of all dial peer or save them if you ahve to go back.
2.config mode
3.ccm-manager mgcp
4.ccm-manager config server xxx.xxx.xxx.xxx
5.ccm-manager config
this should get you going. a simple search on the tac web site should provide a lot of information.