CXProviderDelegate methods are not triggered

Question

I am trying to integrate CallKit into my Voip app. I referred to the SpeakerBox sample code from Apple WWDC. I created a ProviderDelegate class and I am able to see the incoming call UI after calling reportNewIncomingCall method.

But when I tap on the "Answer"/"End" button, the respective provider delegates are not fired. What could be wrong here?

Please note that "providerDidBegin" is called when I instantiate the CallProviderDelegate.

@implementation CallProviderDelegate

- (instancetype)init
{
    self = [super init];
    if (self) {
        _providerConfiguration = [self getProviderConfiguration];
        _provider = [[CXProvider alloc] initWithConfiguration:_providerConfiguration];
        [_provider setDelegate:self queue:nil];
    }
    return self;
}

- (void)providerDidBegin:(CXProvider *)provider {
   // this is getting called
}

- (void)provider:(CXProvider *)provider performAnswerCallAction:(CXAnswerCallAction *)action {
  // this is not getting called when the Answer button is pressed
}

- (void)reportNewIncomingCallWithUUID:(nonnull NSUUID *)UUID handle:(nonnull NSString *)handle
                           completion:(nullable void (^)(NSError *_Nullable error))completion {

    CXCallUpdate *update = [[CXCallUpdate alloc] init];
    update.remoteHandle = [[CXHandle alloc] initWithType:CXHandleTypePhoneNumber value:handle];
    update.hasVideo = NO;

    [_provider reportNewIncomingCallWithUUID:UUID update:update completion:^(NSError * _Nullable error) {
        completion(error);
    }]; 
}

In Caller Class:

CallProviderDelegate *providerDelegate = [[CallProviderDelegate alloc] init];
[providerDelegate reportNewIncomingCallWithUUID:[NSUUID UUID] handle:@"Raj" completion:^(NSError * _Nullable error) {
            //
 }];

Answer 1

In your "caller" class, i.e. the code in which you instantiate the CallProviderDelegate class and assign it to the providerDelegate variable, are you storing the providerDelegate object reference in an instance variable or property? If it is only being assigned to a temporary local variable, then the CallProviderDelegate object will be deallocated after the calling method finishes executing, and if the CallProviderDelegate object is deallocated then no further CXProvider delegate messages will be delivered.

I'd check that your CallProviderDelegate object is not being accidentally deallocated first.