Whenever I start speaking on a call, the incoming audio cuts out. As soon as I stop speaking, the incoming audio is perfect and crystal clear. It's like a half-duplex call.
I'm trying Zoiper Android (basic/free) on Android 6 over 5Ghz wi-fi and using SipGate as my VOIP supplier. I have 150Mbit internet and the ping time to my supplier is 30ms.
I have tried turning off echo cancellation and AGC with no effect.
The problem may be similar to this question which didn't get an answer with a different VOIP supplier.