I've tried this setup with VICIDIAL in small testing environment, but I would not dare to go to production with a MySQL Cluster, since it is a Memory based cluster...
From the MySQL Cluster FAQ
n MySQL-5.0, Cluster is in-memory only. This means that all table data (including indexes) is stored in RAM. Therefore, if your data takes up 1GB of space and you want to replicate it once in the cluster, you need 2GB of memory to do so (1 GB per replica).
And since vicidial_list & call_log/vicidial_agent_log tables grow rather fast, I would not advice to go this direction. (yet)
Thank you,
Alejandro