curl --request POST \
  --url https://api.daily.co/v1/rooms/{room_name}/dialOut/start \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "sipUri": "<string>",
  "phoneNumber": "<string>",
  "extension": "<string>",
  "waitBeforeExtensionDialSec": 0,
  "displayName": "<string>",
  "userId": "<string>",
  "callerId": "<string>",
  "video": true,
  "videoSettings": {
    "width": 1280,
    "height": 720,
    "fps": 15,
    "videoBitrate": 900
  },
  "codecs": {
    "audio": [
      [
        "OPUS",
        "G722",
        "PCMU",
        "PCMA"
      ]
    ],
    "video": [
      [
        "H264",
        "VP8"
      ]
    ]
  }
}
'

import requests

url = "https://api.daily.co/v1/rooms/{room_name}/dialOut/start"

payload = {
    "sipUri": "<string>",
    "phoneNumber": "<string>",
    "extension": "<string>",
    "waitBeforeExtensionDialSec": 0,
    "displayName": "<string>",
    "userId": "<string>",
    "callerId": "<string>",
    "video": True,
    "videoSettings": {
        "width": 1280,
        "height": 720,
        "fps": 15,
        "videoBitrate": 900
    },
    "codecs": {
        "audio": [["OPUS", "G722", "PCMU", "PCMA"]],
        "video": [["H264", "VP8"]]
    }
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    sipUri: '<string>',
    phoneNumber: '<string>',
    extension: '<string>',
    waitBeforeExtensionDialSec: 0,
    displayName: '<string>',
    userId: '<string>',
    callerId: '<string>',
    video: true,
    videoSettings: {width: 1280, height: 720, fps: 15, videoBitrate: 900},
    codecs: {audio: [['OPUS', 'G722', 'PCMU', 'PCMA']], video: [['H264', 'VP8']]}
  })
};

fetch('https://api.daily.co/v1/rooms/{room_name}/dialOut/start', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.daily.co/v1/rooms/{room_name}/dialOut/start",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'sipUri' => '<string>',
    'phoneNumber' => '<string>',
    'extension' => '<string>',
    'waitBeforeExtensionDialSec' => 0,
    'displayName' => '<string>',
    'userId' => '<string>',
    'callerId' => '<string>',
    'video' => true,
    'videoSettings' => [
        'width' => 1280,
        'height' => 720,
        'fps' => 15,
        'videoBitrate' => 900
    ],
    'codecs' => [
        'audio' => [
                [
                                'OPUS',
                                'G722',
                                'PCMU',
                                'PCMA'
                ]
        ],
        'video' => [
                [
                                'H264',
                                'VP8'
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.daily.co/v1/rooms/{room_name}/dialOut/start"

	payload := strings.NewReader("{\n  \"sipUri\": \"<string>\",\n  \"phoneNumber\": \"<string>\",\n  \"extension\": \"<string>\",\n  \"waitBeforeExtensionDialSec\": 0,\n  \"displayName\": \"<string>\",\n  \"userId\": \"<string>\",\n  \"callerId\": \"<string>\",\n  \"video\": true,\n  \"videoSettings\": {\n    \"width\": 1280,\n    \"height\": 720,\n    \"fps\": 15,\n    \"videoBitrate\": 900\n  },\n  \"codecs\": {\n    \"audio\": [\n      [\n        \"OPUS\",\n        \"G722\",\n        \"PCMU\",\n        \"PCMA\"\n      ]\n    ],\n    \"video\": [\n      [\n        \"H264\",\n        \"VP8\"\n      ]\n    ]\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.daily.co/v1/rooms/{room_name}/dialOut/start")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"sipUri\": \"<string>\",\n  \"phoneNumber\": \"<string>\",\n  \"extension\": \"<string>\",\n  \"waitBeforeExtensionDialSec\": 0,\n  \"displayName\": \"<string>\",\n  \"userId\": \"<string>\",\n  \"callerId\": \"<string>\",\n  \"video\": true,\n  \"videoSettings\": {\n    \"width\": 1280,\n    \"height\": 720,\n    \"fps\": 15,\n    \"videoBitrate\": 900\n  },\n  \"codecs\": {\n    \"audio\": [\n      [\n        \"OPUS\",\n        \"G722\",\n        \"PCMU\",\n        \"PCMA\"\n      ]\n    ],\n    \"video\": [\n      [\n        \"H264\",\n        \"VP8\"\n      ]\n    ]\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.daily.co/v1/rooms/{room_name}/dialOut/start")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"sipUri\": \"<string>\",\n  \"phoneNumber\": \"<string>\",\n  \"extension\": \"<string>\",\n  \"waitBeforeExtensionDialSec\": 0,\n  \"displayName\": \"<string>\",\n  \"userId\": \"<string>\",\n  \"callerId\": \"<string>\",\n  \"video\": true,\n  \"videoSettings\": {\n    \"width\": 1280,\n    \"height\": 720,\n    \"fps\": 15,\n    \"videoBitrate\": 900\n  },\n  \"codecs\": {\n    \"audio\": [\n      [\n        \"OPUS\",\n        \"G722\",\n        \"PCMU\",\n        \"PCMA\"\n      ]\n    ],\n    \"video\": [\n      [\n        \"H264\",\n        \"VP8\"\n      ]\n    ]\n  }\n}"

response = http.request(request)
puts response.read_body

{
  "ok": "true",
  "sessionId": "UUID of the dial-out session"
}

{
  "error": "invalid-request-error",
  "info": "missing required field"
}