I have a SPA400 with 3 FXO ports ran into it that all get answered by the AA. I also am using the SPA400 for VM. I know that is going against design considerations and want to know if that is why I'm experiencing this issue: The first call comes in and gets answered by the AA fine. A second and third call comes in and the AA answers but all you hear is silence. We know the 2nd and 3rd call hits the system because the pots LED on the front of the SPA400 are lit. Also, even though the AA is silent, you can still dial an extension and get connected to a phone. Thoughts?