<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Communications\Calls\Item\Participants\MuteAll\MuteAllPostRequestBody;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new MuteAllPostRequestBody();
$requestBody->setParticipants(['', ]);
$requestBody->setClientContext('clientContext-value');
$result = $graphServiceClient->communications()->calls()->byCallId('call-id')->participants()->muteAll()->post($requestBody)->wait();