My white-labelled VoIP softphone for iPhone has suddenly stopped connecting to our FreePBX server. The SIP phones in the shop are still registering fine, so the fault is isolated to the mobile client. What I’m seeing • The crash happens right at app launch—before any SIP registration attempt completes. • Neither the app codebase nor the iOS version on the device has been updated. • No server or network settings were changed. What I need 1. Diagnose the root cause of the startup failure (Swift / Objective-C, pjsip or whichever SIP stack the app uses). 2. Patch the code, rebuild in Xcode, and supply a TestFlight build so I can confirm the app registers and places/receives calls again. 3. Hand over concise notes on the fix so I can merge it into the main repo. You’ll have access to: • The current Xcode project. • SIP credentials and the FreePBX endpoint for testing. • Crash logs and a device for live debugging if needed. Please be comfortable with iOS networking, SIP/VoIP frameworks, push notifications (APNs / VoIP pushes), and Apple’s background modes for VoIP. Once the app launches and registers successfully again, I’ll consider the job complete and release payment.