List SIP accounts

Example response

{
  "sip_accounts": [
    {
      "active": true,
      "auth_method": "password",
      "channel_limit": 3,
      "id": "2BZgTQS4X0qaUEHt4YF-oQ",
      "name": "demo",
      "username": "demo"
    },
    {
      "active": true,
      "auth_method": "password",
      "channel_limit": 0,
      "id": "BY-dC7rY4Key-G5NlIkGZA",
      "name": "demo-eu",
      "username": "demoeu"
    }
  ]
}