It blocks it, on some way. There is no ring. But the lock screen reports the missed calls. It showed the caller identity. :-\ The Avast log reported it as blocked.

Let me try some things first that might be wrong from my side. I have double the contacts. The SIM and Device contacts on the dialer. But blocked only the Device Contacts on the AVAST SMS and Call filter. There is a caller filter natively in the HTC Dialer also that I missed. Let me play with different settings. I may find something…

For now I blocked ALL the contacts (SIM and Device) through the avast filter. Waiting for the call. She hasn’t called yet. ???

If this fails, I’ll try the native caller filter. If it fails too, then something 's wrong with the ICS 4.0.3 kernel. Or something beyond our powers.

I 'll keep you informed for any progress.