Ok let me see if I can explain this. The ICMP Type 3 messages are not your VoIP packets. An ICMP type 3 Message is a destination host unreachable message. Now, if the router is somehow blocking traffic to the IPs that are reflected in the type 3 messages, we can take a look at that. I need to know more about the carrier, the voip device and the codec that you are running.
As a side note: I understand you are frustrated, please remember there are many of you, and few of us at this level of support. We are working as diligently as we can to assist you in your time of need. Please do not allow your return "window" to lapse, in the event that we can not Correct this issue without a firmware upgrade.