Do not put the extension for MWI on/off on the Unity ports. You could use the example 1098 for MWI on and 1099 for MWI off. In CallManager, you define the MWI on/off extensions and this must also match in Unity's TSP (wave drivers). The CCM section is defined in 3.3 Feature, Voicemail, Message Waiting menu. The phones must also be in the same Calling search space as your MWI on/off. As for the ports, the first port number is the Voicemail pilot number, for example, 1001. Since you are using a demo system with two ports, Unity port 1 will be extension 1001 and in CCM will forward busy/no answer to 1002. The second port, 1002, will not forward since it is the last one. Also, make sure one of these ports is configured to dial-out MWI.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...