I am lost right now need some help, We recently upgrade att from 20 meg to 150 and they came out installed same model router and ran new line to it. During the turn up we moved our cisco router to the new att router and data was fine but our voip phones instantly lost. Getting error 480 temp unavailable followed by ICMP error. Of course att saying nothing changed from last router to new. Onsip our voip provider was not able to help find root cause either. Any ideas where to look while I'm waiting for some sort of response from att would be very appreciated and helpful
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