I have several carriers, and I use: <action application="set" data="continue_on_fail=true"/> ... so I was a little surprised to see that a call that ended with NORMAL_TEMPORARY_FAILURE didn't route advance. I dug into the PCAPs of this and comparable, and the only difference I noticed was that the ones that worked were invite -> 100 and then 503 NORMAL_TEMPORARY_FAILURE and the one that didn't work was invite -> 100, 183, and then 503. I have a lua script that told me: session:getVariable("originate_disposition") = SUCCESS session:getVariable("bridge_hangup_cause") = NORMAL_TEMPORARY_FAILURE so... I'm guessing that a 183 marks the originate as a success which is why continue_on_fail didn't work, since it wasn't a fail. Is this expected? Is the carrier "doing something wrong" here? They did helpfully send: "SIP/2.0 503 Service Unavailable - Route Advance" More importantly: how can I fix it? Thanks, -Avi Marcus BestFone