Cross-Platform Softphone App Build

@infowider11

***** Production-Ready WebRTC Softphone for iOS & Android (SIP-Based)**** Hello, How are you? I checked your JD and you need a polished, enterprise-grade softphone for iOS and Android, built on WebRTC for media and SIP for signalling, fully compatible with your existing PBX. The app will support core calling features, visual voicemail, SMS conversations, contacts, call history, and a built-in web view, wrapped in a clean, brand-consistent UI. Push notifications (APNs & FCM), call quality metrics (MOS, jitter, packet loss), and secure authentication/onboarding will be integral to the build. Delivery will include native-quality mobile builds, well-documented source code, and clear configuration for SIP, STUN/TURN, and branding. Let’s chat… Thanks

@augurstech

A Warm Hello! We are readily available to start working on this project! We are confident to provide you production-ready mobile softphone for iOS and Android that integrates cleanly with your existing Hosted PBX, supports standard SIP signaling with WebRTC media, and presents a polished, corporate UI aligned with your product line. Once accepted, we’ll review your PBX specifics, SIP extensions, and branding guidelines, then finalize milestones and timelines. We’re ready to begin immediately and can deliver in phased builds for early testing and feedback. We look forward to partnering with you on this. Regards Ana

@ethervision

I’ve created similar WebRTC based communication platforms before, including PrivateLyne and PartyLine, created for both iOS and Android, with Turn and Stun servers hosted on AWS. Both used push notifications to announce calls. I’ve been programming mobile apps for as long as they’ve existed. The first commercial app I developed, iBeer, was released the first day that the App Store opened, back in 2008. I can easily create exactly what you are looking for. I look forward to discussing your project in depth. Thanks, Christopher Howell-Palenske

@diektech

Hi, This is Elias from Miami. I checked your brief and I understand you need a production-ready softphone for iOS + Android using SIP for signalling (UDP + TLS) and WebRTC for media, with a polished corporate UI. Core features include calling (transfer, hold/resume, DTMF, BLF), local audio mixing for merge/ad-hoc conference, visual voicemail, two-way SMS threads, contacts (local + hosted), recents, plus an in-app web view. Push is required for inbound calls/messages (APNs + FCM), and you want call quality stats (MOS, jitter, packet loss) exposed for troubleshooting. This is very doable, but the success criteria is all about edge cases: backgrounding, push wake-up, registration stability, audio routes, and clean interoperability with your hosted PBX. I can build it either native (Swift/SwiftUI + Kotlin/Compose) or cross-platform if you prefer, but for SIP/WebRTC + push reliability I usually lean native so we can control CallKit/PushKit on iOS and telecom/audio focus on Android. A few questions so we implement it exactly to your PBX: -Q1 Which PBX are you testing against (Asterisk/FreePBX/FusionPBX/Kamailio, etc.), and do you require SIP over WSS anywhere, or strictly UDP/TLS? -Q2 For SMS, is it SIP MESSAGE, a PBX REST API, or a separate SMS provider that we should hook into? -Q3 Visual voicemail: do you expose voicemail as IMAP/HTTP download, or should we integrate via PBX API to list + fetch recordings? Looking forward to hearing from you. Regards.

@tangramua

With over two decades of experience, our team is more than capable of building a production-ready softphone app that's cross-platform using WebRTC and standard SIP. We're well-versed in Android native development (Java, Kotlin), iOS native development (Swift, Objective-C), as well as cross-platform development in Flutter and React Native -- all technologies specifically required for your project. More than just offering the technological know-how, we understand the importance of forging a user-friendly interface that seamlessly integrates with your existing system. This means we're committed to creating a softphone app with an onboarding process for new customers and an authentication flow against your existing PBX. We'll even build in handy features like transfer and local audio mixing, BLF, hold/resume, DTMF and voicemail playback to ensure it covers all bases. We also able to troubleshoot & resolve any potential issues arising from configuring push notifications/alike. Plus, we have their | 24/7 technical support crew who'll be able to assist in case issues arise even after project delivery. Kind regards Anton Sales Department Tangram Canada Inc

@shivmirthyusl

Hello, I’ve reviewed your requirement for a production-ready softphone built on WebRTC and standard SIP, and it’s very much in our wheelhouse. We understand the need for a clean, corporate-grade iOS and Android app that authenticates against your existing PBX (or supports new customer onboarding) and delivers reliable voice, messaging, and voicemail features. Our approach covers SIP (UDP/TLS) signaling with WebRTC media, push notifications via APNs and FCM, and a polished UI aligned with your product branding. We’ll implement core calling features (hold/resume, transfer, BLF, conferencing, DTMF), visual voicemail, two-way SMS, contacts, call history, and in-app web view. Code will be clean, well-documented, and test-ready against your Hosted PBX, with clear configuration and QA handover. Best, SNR

@ciss26

Hello, I hope you are doing well. I understand that you are looking to build a MOBILE APPLICATION and I would be happy to help. I have extensive experience in designing and developing Application and have successfully delivered many projects. What I offer: -Development using the latest technologies -Daily project updates and clear communication -On-time delivery within the agreed timeline -Complete source code provided after project completion -One year of support for the developed work -10+ years of experience in web and app development -Fully responsive, fast-loading, and SEO-friendly design -A powerful super admin panel to manage the entire system Please feel free to initiate a chat so we can discuss your requirements in detail. Thank you and regards, Dheeraj K.

@DeveloperStation

Hi there, We’ve built several WebRTC-based apps, including a fully functional softphone that integrates with Asterisk and FreePBX. We understand the nuances of SIP and WebRTC, and we’ve developed features like call recording, voicemail, and call quality metrics. We also have extensive experience with mobile frameworks like Flutter and React Native, and we’ve delivered multiple production-ready apps using these technologies. We can start with a quick 10-minute introductory call to discuss your project in more detail and ensure I’m the right fit for your needs. Feel free to message me anytime—I usually respond within 10 minutes. Let’s schedule a call and explore how I can help you achieve your goals. Best, Adil

@ZohaibRoy

⭐⭐⭐⭐⭐ Build a Production-Ready Softphone for iOS and Android Using WebRTC ❇️ Hi My Friend, I hope you are doing well. I’ve reviewed your project requirements and noticed you are looking for a production-ready softphone. You have no need to look any further as Zohaib is here to help you! My team has successfully completed 50+ similar projects for softphone applications. I will implement voice calling, SMS, visual voicemail, and a clean interface that matches your product line. ➡️ Why Me? I can easily create your softphone as I have 5 years of experience in mobile app development, specializing in WebRTC and SIP. My expertise includes audio mixing, call management, and user authentication. Additionally, I have a strong grip on React Native, Flutter, and other relevant technologies, ensuring a polished and professional outcome. ➡️ Let's have a quick chat to discuss your project in detail and let me show you examples of my previous work. Looking forward to discussing this with you in chat. ➡️ Skills & Experience: ✅ WebRTC Development ✅ SIP Integration ✅ iOS Development (Swift/SwiftUI) ✅ Android Development (Kotlin/Jetpack Compose) ✅ Voice Calling Implementation ✅ SMS Functionality ✅ Visual Voicemail Features ✅ User Authentication ✅ UI/UX Design ✅ Push Notifications ✅ Call Quality Monitoring ✅ Source Code Documentation Waiting for your response! Best Regards, Zohaib

@mahig47

Hello! As per your product specification you are looking to build a production ready cross platform softphone application for iOS and Android using WebRTC for media and standard SIP for signalling. The goal is to deliver a secure and polished mobile app that integrates with your existing PBX supports new customer onboarding and provides a clean corporate interface aligned with your product line. My focus will be on delivering a reliable voice and messaging solution with high call quality and a professional user experience. This includes SIP based authentication voice calling with transfer hold resume BLF DTMF and local audio mixing for merge and ad hoc conferencing visual voicemail with playback delete and download two way SMS in a threaded conversation view embedded web view for your webpage contact management recent call history and push notifications for incoming calls and messages on both platforms. I specialize in building real time communication applications using WebRTC SIP and mobile native technologies. My focus will be on call stability media performance accurate call state handling push notification reliability and exposing clear call quality metrics such as MOS jitter and packet loss for troubleshooting along with a clean documented codebase and configuration friendly setup. Let’s connect to align on SIP integration details call flows and a clear delivery roadmap for the softphone app. Best regards, Nikita Gupta

@CANWS

Helllo, I will deliver a production-ready Flutter softphone for iOS and Android using WebRTC for media and SIP (UDP/TLS) for signaling, fully compatible with your PBX. The app will include calling features (transfer, hold, BLF, conferencing, DTMF), visual voicemail, two-way SMS, contacts, call history, push notifications (APNs/FCM), and real-time call quality stats. The solution will ship as polished Flutter builds with full source code, configuration documentation, and QA validation through PBX lab testing and live demo.

@ssquare489

I am Sumit Joshi from Sacesta Technologies. How I’ll approach it • Voice Calling: Implement WebRTC for media handling, SIP for signaling (UDP and TLS), supporting features like call transfer, merge, hold/resume, and DTMF • Visual Voicemail: Add functionality for voicemail playback, deletion, and download within a simple, intuitive UI • Two-way SMS: Enable SMS inside the conversation view for a smooth user experience • Web Browser View: Include a web browser view to display your webpage, ensuring it fits seamlessly with the app's interface • Contact Lists: Integrate both local and hosted contact lists for easy access • Call History: Display recent call history for user convenience • Push Notifications: Implement inbound call and message push notifications using APNs and FCM • Call Quality Stats: Surface stats like MOS, jitter, and packet loss for troubleshooting • UI Design: Ensure a professional, corporate-style interface with clean typography, a restrained color palette, and minimal icons Relevant work • Developed a WebRTC-based mobile app with similar functionality, including voice, video calling, and SMS integration, for a large-scale enterprise client I’ll ensure the app meets your technical and design requirements, with successful testing against your Hosted PBX instance and a live demo for approval. Regards, Sumit Joshi

@novatech2210

Hello, Matthew, nice to meet you. I've just completed a similar cross-platform voice assistant project for another client who needed a robust softphone solution for their business. As a seasoned expert in WebRTC and SIP technology, I'm confident I can deliver a production-ready softphone app for both iOS and Android that meets your exact requirements, including voice calling, visual voicemail, two-way SMS, and a clean corporate-style interface. Using WebRTC for media handling and SIP (UDP and TLS) for signalling, I'll implement all core features, including call transfer, local audio mixing, BLF, hold/resume, and DTMF, as well as integrate push notifications for inbound calls and messages on both platforms. I'll also surface call quality stats for troubleshooting and ensure a polished, professional UI that matches your brand identity. Previous clients have seen significant results, such as reduced testing time by 50% and seamless integration with their existing PBX systems. Multiple 5-star reviews on real-time voice AI apps and SIP integrations speak to my expertise and reliability. Happy to hop on a quick call (no obligation) to discuss architecture, timeline, and a clear plan + quote. Chris | Lead Developer | Novatech

@istackgroup

With over a decade of experience as a Full Stack Software Developer and proficiency in a wide array of programming languages, frameworks, and tools that includes React Native and Flutter which are fundamental to your project, I am Muhammad Awais - your perfect candidate! Apart from my robust skills in Android (Kotlin/Jetpack Compose) and iOS (Swift/SwiftUI), I also have a deep understanding of WebRTC and standard SIP. Your requirement for push notifications, call quality stats, polished UI/UX is something I take very seriously. My experience aligns impeccably with all that you need for the softphone app. Having worked on numerous projects incorporating voice calling, conference calling, voicemail systems, and local audio mixing, I'm very confident about offering well-commented source code in both Swift/SwiftUI and Kotlin/Jetpack Compose as well as having builds tested against host instances ensuring zero complications. In addition to these, my familiarity with messaging services via send/receive SMS conversations adds another skill set to provide a smooth user interface for your app. I pride myself on not only delivering high-quality work but doing so on time – every time. My work is focused on ensuring the client's goals are met without compromising on any aspect. This dedication to detail has earned me repeat clients throughout the years since 2012! So let's collaborate and turn your visionary cross-platform softphone app into a productive reality!

@AZTURK1

Hi there, I'm excited about building your cross-platform softphone app that aligns perfectly with your corporate style and integrates seamlessly with your existing PBX. - Develop native-like iOS (SwiftUI) and Android (Kotlin/Jetpack Compose) apps using React Native/Flutter. - Implement full WebRTC media handling and SIP signaling with UDP/TLS, including call transfer, BLF, hold/resume, and DTMF. - Integrate features like visual voicemail, two-way SMS, contact lists, call history, and push notifications (APNs & FCM). - Provide polished UI matching your branding with clear typography and unobtrusive icons. - Deliver complete code with documentation and a QA checklist for smooth onboarding and testing. **Skills:** ✅ WebRTC & SIP signaling — voice calling, transfers, conference, and DTMF ✅ iOS & Android native builds with React Native/Flutter ✅ Push notifications setup (APNs & FCM) ✅ Visual voicemail and SMS integration ✅ UI/UX design consistency and professional polish ✅ Source code documentation & QA checklist **Certificates:** ✅ Microsoft® Certified: MCSA | MCSE | MCT ✅ cPanel® & WHM Certified CWSA-2 I'm ready to start immediately and ensure your app passes all tests with a smooth demo. Could you please share more details about your existing Hosted PBX environment and any specific SIP configurations to consider? Best regards,

@juanjosec63

Hello, I’m excited about the opportunity to build a production-ready softphone for iOS and Android using SIP for signaling and WebRTC for media, with a polished corporate UI and a clean onboarding/auth flow against your PBX. With strong mobile and real-time communications experience, I can implement the full calling stack (hold/resume, transfer, BLF, DTMF, merge/conference with local mixing), visual voicemail management, two-way SMS conversations, embedded web view, contacts, and recent call history in a modular codebase that’s easy to extend. I’ll also handle push notifications for inbound calls/messages (APNs/FCM), surface call-quality metrics (MOS/jitter/packet loss) for troubleshooting, and provide a clear configuration guide for SIP domains, STUN/TURN, push keys, and branding. You can expect clean, well-commented source in a private repo, ready-to-test builds for internal distribution, and a QA checklist that demonstrates end-to-end success in a lab environment and a live two-handset demo. Best regards, Juan