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:

Hello, here is the sipcap:

interface: eth0 (74.52.58.48/255.255.255.240) filter: ip and ( port 5060 ) match: 9492666205 ################### U +0.000000 ATA:5062 -> OpenSER:5060