<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Communications\Calls\Item\PlayPrompt\PlayPromptPostRequestBody;
use Microsoft\Graph\Generated\Models\Prompt;
use Microsoft\Graph\Generated\Models\MediaPrompt;
use Microsoft\Graph\Generated\Models\MediaInfo;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new PlayPromptPostRequestBody();
$requestBody->setClientContext('d45324c1-fcb5-430a-902c-f20af696537c');
$promptsPrompt1 = new MediaPrompt();
$promptsPrompt1->setOdataType('#microsoft.graph.mediaPrompt');
$promptsPrompt1MediaInfo = new MediaInfo();
$promptsPrompt1MediaInfo->setOdataType('#microsoft.graph.mediaInfo');
$promptsPrompt1MediaInfo->setUri('https://cdn.contoso.com/beep.wav');
$promptsPrompt1MediaInfo->setResourceId('1D6DE2D4-CD51-4309-8DAA-70768651088E');
$promptsPrompt1->setMediaInfo($promptsPrompt1MediaInfo);
$promptsArray []= $promptsPrompt1;
$requestBody->setPrompts($promptsArray);
$result = $graphServiceClient->communications()->calls()->byCallId('call-id')->playPrompt()->post($requestBody)->wait();