0 votes

We have been trying to debug a situation where Zoiper inot a SIP VOIP provider is having the following issues:

- Sometime fails to connect

- Most commonly connects, but one side or the other can not hear.

- Connects, but does not report the connect on on the calling side.

- Connects, and we can hear each other, but the call only lasts 30 seconds.

What we have done to try to resolve:

- Windows Firewall is turned off.

- Anti virus is turned off

- Windows firewall forces 5060, 10000-20000 ports to be inbound and outbound without blocking.

- Ports 5060 and 10000-20000 are forwarded directly to the win 8.1 computer.

- Stun has been turned on

- Stun has been turned off

- Installed an entirely different computer (Win Tablet) with same failures

- Installed on a cell phone locally connected to the network, with 100% success, but not something we can use.

- Installed on an entirely different computer at an entirely different state in the USA, and everything works.

- Installed linPhone, and it works out of the box.  But, we do not want to use it.

We are at a complete loss. We have spent three days trying to fix this with no solution from ourselves or the provider.

Please help!

in Windows by (140 points)

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