3CX App not working in local network

[PaulEmous]

Ok where to start.

I have been installing 3CX for clients for 8 months and it has been a pleasant ride so far. However something is super annoying and I can't seem to get to the bottom of it.

I have a MacbookPro, Mojave and 3CX app installed. If I connect to a 3CX PBX on a local network with a extension and try to make calls from my laptop, as soon as I make a call via the 3CX app, the app becomes unresponsive and will time out after a good 20 seconds. However, if I connect to a 3CX instance outside the network, (being it a VPN tunnel, direct connection to a public IP or whatever), the app WILL work. To make things even funnier: If I setup a bridge between the remote PBX (Public IP, Ports forwarded etc) via a bridge to the local PBX and make outbound rules (for example "numbers start with 5"); the call gets routed from the remote PBX over the internet, via the bridge to the local PBX and I can use the app without any problems.

I have this problems with all clients. We are using UniFi security gateways / APs.

Wireshark does not give any SIP info once connected with the local server, but when connected to the remote PBX it works like a breeze.

As you understand this is highly annoying because demoing on my laptop (locally) is not possible.

I reinstalled my laptop with a fresh version of OSX, I uninstalled the 3CX app, removed all data etc. Nothing seems to work. However on different machines it's working which makes me believe its my laptop... But where is the problem?

 

[leejor]

Could this be a local DNS issue? I'm assuming that the App shows as registered?
Does the 3CX Activity Log provide any additional information...once dialled, does the call even reach the PBX? What does the registration of the device look like? Normal?

 

[PaulEmous]

Could this be a local DNS issue? I'm assuming that the App shows as registered?
Does the 3CX Activity Log provide any additional information...once dialled, does the call even reach the PBX? What does the registration of the device look like? Normal?

Absolutely nothing. No data is registered. The app freezes; although I can go to settings in the app, I can't hang up the phone call for example. But there is no dailing sound nothing.

DNS is not an issue. I can see, ping, communicate with the server no problem.

 

[PaulEmous]

Ah and yes the app is registered.

 

[cobaltit]

So the only similar experience I had, and which doesn't make sense in you scenario was when there was no mic connected. On Windows, you could make one call without a mic connected and then the soft phone would lock up. You'd have to end task it. I don't see how it would apply in your scenario but that's about the only thing I've seen that can cause the 3CX client to lock up.

In the meantime, you could just use the web client for demoing. That's where it's all going anyways.

 

[PaulEmous]

Agreed. But the webclient brings other issues with it that is out of the scope here. I can receive calls no problem by the way. Only making (outbound) is the problem.