ring out not working with c# SDK

Hello team,

I am using the below code to make a call , i get the status as "in progress" but i don't receive the call on the dialled number. please find the code and screen shot below.

var ringoutPostBodyJson = "{"from":{"phoneNumber":"19295755408","forwardingNumberId":""},"to":{"phoneNumber":"15614097222"},"playPrompt":true,"country":{"id":"1"}}";

var request = new Request("/restapi/v1.0/account/~/extension/~/ringout", ringoutPostBodyJson);

var ringoutResponse = sdk.Platform.Post(request);