We have a Cisco 2811 router running Call Manager & Unity Express. This is the only use we're making of the router. I noticed Cisco has a great tool to configure CME via GUI called CCA (or Cisco Configuration Assistant). I'd love to use this tool, but unfortunately it seems like it is not supported on 2811, only for UC500. I can't seem to understand why though, since as far as I know both are running the same software for voice (CME). I understand Cisco has a sister product for configuring ISRs called CCP but it seems to be outdated and lacking a lot of the great functionality available in CCA (especially for voice related configurations).
Can anyone provide some insight on the subject? Perhaps there is a better and easier way to configure CME on a 2811 other than using CLI? (I know there's a web interface (/ccme.html) but it seems to be quite lame)