Add DTMF example

Author: mheap

voice/play-dtmf-in-to-call/index.php

@@ -0,0 +1,10 @@
+<?php
+require_once __DIR__ . '/../../config.php';
+require_once __DIR__ . '/../../vendor/autoload.php';
+
+$keypair = new \Nexmo\Client\Credentials\Keypair(file_get_contents(NEXMO_APPLICATION_PRIVATE_KEY_PATH), NEXMO_APPLICATION_ID);
+$client = new \Nexmo\Client($keypair);
+
+$dtmf = $client->calls[NEXMO_CALL_UUID]->dtmf();
+$dtmf->setDigits('2468#');
+$dtmf->put();