our server working properly with ANDROID even in the background they can receive incoming calls but , our application have some issue with(IOS) user's they cant receive incoming calls while the lock their iphone they get disconnected in the background , so please we need quick reply from your side to solve this issue because our company asks to ask help from your side , even i have configured the IPHONE quit correctly but i don't know what is the problem they cant receive calls in the lock background ,also we have this issue with the free version and purchase version we bought it with 4.99$ also same issue