Canadian: No sound when calling US numbers

My Phone is a Moto g7 Play. My provider is Koodo (a brand of the Canadian Telus), I am dialing from Canada. My account includes the following feature: > **Unlimited Long Distance Pack** > > Get unlimited long distance calling to 27 countries including the **US**, China, Hong Kong, India, Mexico, Bangladesh, and the UK from anywhere in Canada. When I dial a US number, the call goes through, but there is no sound on my end. I don't hear the ringing tones, the other party, nothing; though once the call connects the other party hears me. Accepting calls (from Canada or the US) works fine. Dialing Canadian numbers works fine. Dialing UK numbers works fine. Dialing a number in a country not in the "Unlimited Long Distance Pack" works fine. Dialing a US toll-free (1-800, 1-888, etc.) number appears to work - I don't hear any ringing tones, but I do hear the message from the other side of the line. It seems that only dialing US non-toll-free numbers has this issue. But here's the kicker: if I put my SIM in a different phone, it works without an issue. What can cause this strange behaviour? ---------- **Edit:** Turning VoLTE off solved the issue. Then I tried WiFi calling, and it exhibited the same issue. So it looks like a VoIP issue (as @Robert suggested in the comments). I now have a workaround, except that I cannot use it when I don't have 3G connectivity. The question is whether it can be solved in a better way, either on my end or by the provider. ---------- **Edit 2:** I had a chat with Telus tech support. Apparently it is a known problem that affects several phone models on their network. There’s a workaround: pausing and resuming the call restores the sound (for that call). They opened a ticket for me too, so maybe a permanent solution will be found.