When we get a call from ATT IPFlex the call is sometimes coming in several times. The asterisk is acting on them per the dial plan and the endpoint gets 2-5 ringing lines. Only one has an actual call on it.
Anyone seen this. Of course AT&T is blaming us.
We use att ipflex. Things are normal over here… Have you narrowed down why it happens? Does AT&T send you multiple INVITE messages? I’ve learned not to underestimate att’s ability to screw things up 
but you should be able to confirm which problem the side is on.