您可以通过请求URL tel：// ###-###-### 来拨打电话>，但这将退出您的应用程序并启动iPhone的默认电话应用程序。由于此时您的应用程序已退出，因此无法播放声音。

You can call a number by requesting the URL tel://###-###-###, but this will quit your application and launch the iPhone's default phone application. There is no way of playing a sound as your application has exited at that point.