Using the API, I'm able to connect from any one phone number to any other phone number as long as they are both outside of my RingCentral account. When I try to use my RingCentral DID it never rings. The status indicates that the call is 'In Progress' and I don't see any error messages. I also tried dialing from company number + extension (like +18001234567*102) and I've tried using the forwardingNumberId, found by grabbing the Id from /account/~/extension/~/forwarding-number. It just acts like it's dialing but never dials.

RestClient rc = new RestClient("My Client Id", "My Client Secret", false);

await rc.Authorize("My Account #", "My Extension", "My Password");

var parameters = new MakeRingOutRequest();

parameters.from = new MakeRingOutCallerInfoRequestFrom { phoneNumber = "15551234567" };

//parameters.from = new MakeRingOutCallerInfoRequestFrom { forwardingNumberId = "My Forwarding Id " };

parameters.to = new MakeRingOutCallerInfoRequestTo { phoneNumber = "18005552900" };

parameters.playPrompt = false;

var resp = await rc.Restapi().Account().Extension().RingOut().Post(parameters);

Console.WriteLine("Call Placed. Call status: " + resp.status.callStatus);