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我正在使用iOS版本9和swift。我可以在应用程序处于活动状态时接听电话，但当应用程序关闭或在后台时，我遇到问题，它只收到通知，而不是完整的铃声（我正在使用SinchService），但它不起作用。我已经添加了VoIP的证书，它是有效的VoIP铃声不起作用
代码
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
sinch?.push().application(application, didRegisterForRemoteNotificationsWithDeviceToken: deviceToken)
}
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any]) {
sinch?.push().application(application, didReceiveRemoteNotification: userInfo)
}
func startManager() {
let config = SinchService.config(withApplicationKey: VoiceManager.SinchKey, applicationSecret: VoiceManager.SinchSecret, environmentHost: VoiceManager.SinchHost).pushNotifications(with: SINAPSEnvironment.development)
let sinch = SinchService.service(with: config)
sinch?.delegate = self
sinch?.callClient().delegate = self
let push = Sinch.managedPush(with: SINAPSEnvironment.development)
push?.delegate = self
push?.setDesiredPushTypeAutomatically()
let appDelegate: AppDelegate = (UIApplication.shared.delegate as! AppDelegate)
appDelegate.sinch = sinch
appDelegate.push = push
}
// MARK： - SINCallClientDelegate
func client(_ client: SINCallClient!, didReceiveIncomingCall call: SINCall!) {
//show calling view
let controller = UIViewController.currentViewController()
VoiceCallingViewController.show(call: call, viewController: controller)
}
func client(_ client: SINCallClient!, localNotificationForIncomingCall call: SINCall!) -> SINLocalNotification! {
let notification = SINLocalNotification()
notification.alertAction! = LanguageManager.localizedString(key: "answer")
notification.alertBody = "\(LanguageManager.localizedString(key: "incomming-call")) \(call.remoteUserId)"
return notification
}