Hi guys; So, we've been working on evaluating the 3cx free version for our business and while most everything went smooth we've come to a point where we definitely need some outside support. To give a quick overview of the system: Windows 7 Professional 64 Bit Sangoma A200 Card with Echo Cancellation and 4x FXO Ports Latest Build of 3CX Free Version Installed At the moment, hooked up to 2x Yealink T28's Configuration of the T28's is as follows: 1x Digital Receptionist at Extension 800 2x Employee Extensions (100 and 101) 3x Department Extensions (200, 201 and 202) Each of the Yealink Phones is configured with 2x 100 and 101 extensions as well as all three department extensions. Error description: When we first restart the server it will take forever for the phones and extensions to register (up to 20 minutes). During this time extension routing will be extremely flaky - Around 50% of the times the system will connect properly to the extensions, whereas the other 50% of the time we get a voice prompt telling us that the destination is unreachable, no routing available, extension isn't registered, etc.... After around 20 minutes the voice prompt will fail, giving us the RTP error. Once this occurs extension and call routing will work 100% of the time. The log from 3CX shows the following: 00:28:43.954 [MS004000] C:34.1: (PASSTHROUGH): Can't send RTP stream to 127.0.0.1:14064 destination unreachable (10049) Any and all help in solving this issue would be greatly appreciated as we are already way behind schedule on our phone system rollout!!