I think the problem is the gateway of bandwidth.com The 183 session progress have all the same To-tag and the same branch value in the topmost via header, although the 3 INVITEs sent to bandwidth.com have different branch value in the Via header. Thus, I suspect the dialog matching of the gateways is broken and it thinks the second and third INVITE is a retransmission of the first INVITE? Although I'm not sure as the gateway sends the 183 reply 3 times in a row. Strange. What happens in the PSTN? Which of the 3 phones ring? +17144828306 ? regards klaus Brandon Armstead wrote: