No sound in my call

I have built an inbound flow. Then I set up a call route with an addresses +13179831227 as the dial-in number.
I logged in as admin and I selected my Phone_Admin in WebRTC phone.

When I dialed +13179831227, I could hear the sound from dialpad. However after call is connected, it's all silent and I couldn't hear any prompt from the IVR call flow.

What could be the cause of it?

General product configuration questions and issues should be posed to the Genesys Cloud Community Forum or reported via a Genesys Cloud Care case. This forum is specific to questions about the Platform API and customizations.

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