Start an outbound call

curl --request POST \
  --url https://api.vocobase.com/api/v2/calls/start \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "agent_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "to_number": "+919876543210",
  "provider": "mcube"
}
'

{
  "success": true,
  "data": {
    "call_id": "c1234567-abcd-1234-abcd-123456789012",
    "session_id": "s1234567-abcd-1234-abcd-123456789012",
    "status": "pending",
    "provider": "twilio",
    "from_number": "+14155551234",
    "to_number": "+919876543210",
    "agent_id": "a1234567-abcd-1234-abcd-123456789012"
  }
}