didUpdatePushCredentials not get called
<p>I want to implement VoIP notifications in my iOS application, But the <strong>didUpdatePushCredentials</strong> method never got called, I can't get the device token.</p>

<p>I had implemented APNS in the application, May these two services conflict ?</p>

<p>Here is my AppDelegate codes</p>

<pre><code>- (void)application:(UIApplication *)application
    didRegisterUserNotificationSettings:(UIUserNotificationSettings *)notificationSettings {
    LOGI(@"%@", NSStringFromSelector(_cmd));

    //register for voip notifications
    self-&gt;pushRegistry = [[PKPushRegistry alloc] initWithQueue:dispatch_get_main_queue()];
    [self-&gt;pushRegistry setDelegate:self];
    [self-&gt;pushRegistry setDesiredPushTypes:[NSSet setWithObject:PKPushTypeVoIP]];

    NSLog(@"VoIP push registered");

}

#pragma mark - VoIP push methods

- (void)pushRegistry:(PKPushRegistry *)registry didUpdatePushCredentials:(PKPushCredentials *)credentials forType:(NSString *)type {
    NSLog(@"voip token: %@", credentials.token);
}

- (void)pushRegistry:(PKPushRegistry *)registry didReceiveIncomingPushWithPayload:(PKPushPayload *)payload forType:(NSString *)type {
    NSDictionary *payloadDict = [payload.dictionaryPayload valueForKey:@"aps"];
    NSString *message = (NSString *)[payloadDict valueForKey:@"alert"];

    if ([UIApplication sharedApplication].applicationState == UIApplicationStateBackground) {
        UILocalNotification *localNotification = [[UILocalNotification alloc] init];
        localNotification.alertBody = [message stringByAppendingString:@" - voip"];
        localNotification.applicationIconBadgeNumber = 1;
        localNotification.soundName = @"notes_of_the_optimistic.caf";

        [[UIApplication sharedApplication] presentLocalNotificationNow:localNotification];
    } else {
        dispatch_async(dispatch_get_main_queue(), ^{
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"VoIP notification" message:message delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
            [alert show];
        });
    }


    NSLog(@"incoming voip notfication: %@", payload.dictionaryPayload);
}

- (void)pushRegistry:(PKPushRegistry *)registry didInvalidatePushTokenForType:(NSString *)type {
    NSLog(@"Voip token invalidate");
}
</code></pre>

<ul>
<li>I enabled remote notifications, Certificate and provisioning profiles are installed.</li>
<li>I can push standard notifications using APNS.</li>
</ul>

<p>Any solution to get it working ?</p>