Thank you Brian,I ran FS with TPORT_LOG=1 ./freeswitch as you said and I got the output below:Note that 3462101 is the DID provider username so it seems to me that the invitation is going to the right place.In one part of the output there is- Processing Unknown->3462101@public - so I think it is trying to reach this username as if it was a FS registered extension in the public profile, and this is not the case.Am I thinking right ?