I need an experienced Linphone developer to turn the open-source iOS client into a fully branded app for business communications. I will supply the app name, logo, color palette and SIP credentials; you handle the code customization, certificate setup and App Store-ready build. The job covers: • Replacing all visible Linphone branding (app icon, splash, in-app graphics, bundle identifier) • Pointing the client to my SIP server, enabling PushKit so incoming calls ring reliably in the background • Generating a release build I can upload to App Store Connect, plus a TestFlight version for final checks Please keep the underlying feature set unchanged—audio/video calls, contacts, call history and chat must work exactly as in the stock app. If you usually script the build process with Xcode, CocoaPods or Swift Package Manager, feel free to note that, as long as I receive clear steps for future updates. I’d like to review the re-skinned interface on an IPA or TestFlight link within a week, then sign off on the store-ready build once everything matches the brand guide.