I am making an app using PJSIP protocol for iOS Platform. My Extension is successfully registered at the Asterisk Server. That time my extension status is reachable. Now my application is in the background. After iOS 8, background task only active within 3 minutes after that it will be suspended. That time my extension status is unreachable but the extension is reachable. so is there any way to keep alive reachable status for a long time? We are using our credential in “Bria-x” application, it always keeps alive registration status to reachable. If it goes to unreachable, within 10 seconds, it is reachable. How can it possible? Please help me to find the concrete solution. Thanks in advance.