curl --request POST \
  --url https://app.callrounded.com/api/v0/calls/phone \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "from_number": "+33912345678",
  "to_number": "+33612345678",
  "agent_id": "411b82c8-462a-4e1b-89bc-10ab3ce1ed29",
  "dynamic_variables_values": {
    "first_name": "John",
    "last_name": "Doe"
  }
}'

{
  "call_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}