wi fi calling sucks

Hi all,

Has anyone found any tips, tricks, or settings that improve Wi-Fi Calling?

So far I have:

• Turned off Wi-Fi Assist on iPhone (iOS).
• Updated to the latest router recommended by the network provider.

Unfortunately, the experience is exactly the same as with my previous router. I had expected Wi-Fi Calling to be more reliable given that it uses relatively little data.

My issue is quite specific: I can hear the other person perfectly, but they often tell me that the first few words I say are cut off, particularly when I start speaking after a pause in the conversation. 

Has anyone experienced this and found a solution?

Thanks in advance for any suggestions.