Q1. check AA configuration, how many ports are enabled ? Checj "show software detail", are the licenses installed ?
Q2. Not on CUE, but can be done on the router. Configure the DP for AA with "max-conn 8", higher precedence, no huntstop. Configure another voip DP, lower precedence, to go gat to a loopback interface and a translation-profile to change the called number to whatever extension you want.
If all this doesn't make sense to you, engange a reputable consultant or certified partner to achieve the results wanted.