iOS App Constantly Drops Calls

[jeffgeno]

We've had an issue over the last couple of weeks that suddenly appeared with our iOS app users. They'll hear beeps after less than a minute in a call and it will attempt to reconnect. Sometimes it's successful, but mostly the call will drop shortly afterwards. Everyone was working perfectly before, but not now. I believe I found a workaround by disabling the "Wi-Fi Assist" option in the iPhone's cellular settings. I'm not sure why that works when their connection is solid (and when Wi-Fi is disabled and they're using the cell network), but it seems to.

Our server is hosted on premises and it completely up to date. It's a Windows VM running on a Hyper-V cluster. It's behind a Meraki firewall on Unifi network switches. All the desk phones, web clients, and Android apps appear to work correctly. It was just the iOS ones that were having trouble.

Was there anything that changed on that app a couple weeks ago? Has anyone else had the same issues? This is with a variety of iPhone models, all running the latest iOS.

 

[Vali_3CX]

The current version (18.0.7) was released on 16th last month, and had no changes regarding connectivity.
But I think I remember somebody here, on the forum, recommending one year ago or something to turn off the device WiFi Assist.

 

[jeffgeno]

I think I've found the solution for us. In the extremely unlikely event that someone else has the same config, I figured I'd update the thread.

We use a Meraki firewall that had a rule in place to block peer-to-peer file sharing. A couple of weeks ago, either the app update or an update to the firewall from Cisco started detecting 3cx app traffic as file sharing and blocking it. Once we removed that Layer 7 Firewall Rule from the Meraki config, everything started working perfectly.

 

[cchsbrad]

I think I've found the solution for us. In the extremely unlikely event that someone else has the same config, I figured I'd update the thread.

We use a Meraki firewall that had a rule in place to block peer-to-peer file sharing. A couple of weeks ago, either the app update or an update to the firewall from Cisco started detecting 3cx app traffic as file sharing and blocking it. Once we removed that Layer 7 Firewall Rule from the Meraki config, everything started working perfectly.

I guess not that extremely unlikely after all. Same Meraki config, same issue. Removed L7 rule and all good! Thanks for posting this!!

 

[ehernandez@elpasodiocese.]

I guess not that extremely unlikely after all. Same Meraki config, same issue. Removed L7 rule and all good! Thanks for posting this!!

I think I've found the solution for us. In the extremely unlikely event that someone else has the same config, I figured I'd update the thread.

We use a Meraki firewall that had a rule in place to block peer-to-peer file sharing. A couple of weeks ago, either the app update or an update to the firewall from Cisco started detecting 3cx app traffic as file sharing and blocking it. Once we removed that Layer 7 Firewall Rule from the Meraki config, everything started working perfectly.

Thanks for the info have the same issue and the same firewall and rule activate let me change that