Cisco is supposed to be releasing the updated Keyswitch feature set (renamed IP Telephony Services) sometime soon; hopefully next month. We've also been having major problems deciding which images to use for specific features, because it seems the hardware is way ahead of the software.
For example, try using MGCP on a gateway with both FXO and PRI modules (a very common config)...sorry, MGCP is not supported for PRI.
What about SRST on a gateway with PRI? Sorry again, SRST only works with FXO.
We have tried using some of the 'X' code images and have multiple TAC cases open and many hours of unbillable services for our troubles. Be careful.
My guess is, Cisco will work out all of these feature/image issues soon. This technology is very cool, but very new.
-Tim