Every outbound call we make from the 3CX Softphone whether internal or external drops at 16 seconds. Extension to extension calls (softphone to softphone) never drop. I've got 3CX installed on a Win Server 2008 R2 64 bit machine. Using Generic SIP trunk on a T1. The T1 is giving us a straight ethernet connection and both the SIP trunk and the T1 are provided by Windstream. Local ISP/Phone company. I have seen were it could be an ACK issue, or Keep Alives, but I have the Keep Alive set in 3CX. I can't see anything (obviously or I would have figured this out by now) in the server logs, the Softphone logs or packet traces. I have attached the Server log during a call in question. This particualr one was with an external extension using the Tunnel and I'm not using STUN since I'm using a static IP and port forwarding. I could so use some insight on this issue.