Andy,
There is an CME/IOS limitation of 15 rules under a voice translation rule. If you have any numbers and extensions that are sequential, you can combine some of them into one rule using CCA.
There are other ways around this, like using a different access code. Which would allow you to keep your configuration inside of CCA.
The only other way I can think of, would involve some CLI configuration, and using COR lists.
Thank you,
Darren