Welcome to the RingCentral Community

Curl is not a programming language but it is still possible to do it with curl.

The first step is to obtain the access token: 

curl -i -X POST "https://platform.devtest.ringcentral.com/restapi/oauth/token" \ -H "Accept: application/json" \ -H "Content-Type: application/x-www-form-urlencoded" \ -u "clientId:clientSecret" \ -d "username=username&password=password&extension=extension&grant_type=password"

With the token, invoke the RingOut API:

curl -X POST --header "Content-Type: application/json" \ --header "Accept: application/json" \ --header "Authorization: Bearer <access-token>" \ -d "{\"from\":{\"phoneNumber\":\"12345678\",\"forwardingNumberId\":\"\"},\"to\":{\"phoneNumber\":\"87654321\"},\"callerId\":{\"phoneNumber\":\"\"},\"playPrompt\":false,\"country\":{\"id\":\"\"}}" \ "https://platform.devtest.ringcentral.com/restapi/v1.0/account/~/extension/~/ring-out" 

 Ref:
https://github.com/ringcentral/ringcentral-faq/blob/70ae4be20d858179e28a630d38148f9fb44fe238/docs/oa...

https://developer.ringcentral.com/api-explorer/latest/index.html#/!/RingOut/makeRingOutCallNew

Curl

Hi Bill,

What you were told to use is RingCentral Restful API. It could not be done via a single url. Instead, you need to write some code. If you tell me your programming language I can show you sample code.