I would appreciate it if anyone could point me in the right direction. 1 - When outgoing calls are made from our “in premise” Cisco 7960 phones - on every occasion the call drops after approximately 30 / 32 seconds. Incoming calls from all sources are fine. 2 - Whenever one of our Cisco 7960 phones ends a call and the other caller does not hang up, I can see from the Myphone interface that while the Cisco phone has dropped the call, the call persists in a connected state within the PBX, until the other caller terminates the call on their phone.. Background We had been running a 3cx ver 11 PBX on Windows Server in our Portsmouth Office for a couple of years without issues. The system comprised of a Windows 2008 Server, 8 port PoE Switch, Cisco EA500 fiber router and 6 Cisco 7960 handsets. We have a small number of field workers who tunnel into the PBX using the 3CX Softphone. A number of our users both in the premises and remotely use the desktop 3cx Myphone in addition to their hard or soft phones. As mentioned previously this system operated reliably for a couple of years Recently we decided to host our PBX on an AWS EC2 M1 Small instance which has been launched into a VPC (Virtual Private Cloud), with both a static public ip and static private ip address. In our new hosted setup the “in premise” Cisco phones are connected to the AWS hosted PBX through the same switch and Cisco EA4500 Router (as previously connected to the local PBX) using the 3CX Sip Proxy Manager. The phones pull their configuration files from a TFTP server sitting on the “in premise” Network and the individual phones successfully register as extensions within the AWS hosted 3CX Management Console. Generally the new setup for the phone system works well apart from the issues described above. Calls made to both the “in premise” Cisco phones and “off premise” softphones from external numbers work perfectly and as expected. Calls made from softphone to softphone attached on a PBX extension, and to external numbers work perfectly and as expected. Any advice would be appreciated.