Call API

You use Call API to make outbound calls from Nexmo virtual numbers to other phone numbers. You can:

  • Create Call me buttons.
  • Automate calls in your App.
  • Manage event-prompted calls.

This section briefly explains the Call API workflow.

Call API workflow

To use Call API you:

  1. Create a Call using the request.
    Note: if your VoiceXML triggers a transfer, you receive separate Call Return Parameters for each leg of the call.
  2. Receive a Response and check the Response codes to ensure that you sent the request to Nexmo correctly.
  3. Receive the Call Return Parameters at your webhook endpoint so you can see:
    • If the Call Result was successful.
    • When and how the call was made.
    • How much the call cost.
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