curl --request POST \
  --url https://api.open.cx/phone/sip/outbound-trunks \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "host": "<string>",
  "username": "<string>",
  "password": "<string>",
  "caller_number": "<string>",
  "port": 32768,
  "transport": "udp"
}
'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "name": "<string>",
  "created_at": "<string>",
  "updated_at": "<string>"
}