Sinds a few months I use a voip app (Dubline) for a business phonenummer. All of the people I call and are calling me experience an echo. I’ve contacted the appmaker severall times and recieved app updates. Yet the echo stays an makes it impossible to use the app.
Before I switch to another VOIP provider I want to rule out any problems with my microphone or my phone in general. Do you know any way or troubleshooting the check where the problem originates from?
Any help is appreciated.