App Developer for SIP Integration

@asifalimzd

Hi there, I can build your Android SIP calling app with SIP login, incoming/outgoing calls, dial pad, call history, speaker, mute, hold and reliable background incoming-call handling. I’ll integrate it with your Asterisk/FreePBX SIP server, test call flows and background behavior on real Android devices, and deliver the complete source code plus a Play Store-ready APK/build. Could you share your Asterisk/FreePBX SIP setup or API/SIP details so I can confirm the integration approach and timeline? Kindly send me a message to discuss more or directly award me. Thank you!

@VianRey1

SIP integration with Asterisk and FreePBX is where most apps break. You need incoming and outgoing calls, a working dial pad, and background calls that actually work. Once this is running, your team will have a business app ready for the Play Store, with real call history and speaker, mute, hold options built in. No more missed calls or clunky workarounds. I’ll send you a first draft of the app flow, so you can see how your SIP login and call features fit together. Then I’ll build out the APK and get it Play Store ready. Last step, you get the source code and full handover. Funds stay in the milestone until you’re satisfied everything works. Want me to send over the first draft app flow?

@muhammadsaad90

I can build a reliable SIP calling app with a clean interface and the core functionality needed for business users, including secure SIP login, incoming/outgoing calls, and call management. I’d implement the dial pad, call history, speaker, mute, and hold controls, with SIP server integration supporting Asterisk/FreePBX. The app will be structured to handle background incoming calls reliably while keeping the calling experience responsive and stable across supported Android devices. One important edge case is maintaining SIP registration and receiving calls when the app is running in the background. I’ll handle connection states, authentication, network changes, and call lifecycle events carefully to avoid missed calls or unstable sessions. Before delivery, I’ll test SIP login, incoming/outgoing calls, call history, audio controls, background calling, Asterisk/FreePBX connectivity, and common network scenarios. I’ll provide the complete source code along with a tested APK and Play Store-ready release build.

@Synet

Hi, Building a reliable calling app on Android means setting up the SIP stack so it stays connected in the background without draining the battery. I will build your business application using Java and integrate the PJSIP library or Linphone SDK to handle Asterisk and FreePBX servers smoothly. This setup covers your SIP login, dial pad, call history, and in call controls like speaker, mute, and hold for both incoming and outgoing calls. For the background call handling, I will configure Android foreground services and push notifications so incoming calls wake the app reliably even when it is closed. You will also get a handy feature where call audio automatically switches to your connected Bluetooth headset if one is nearby, which is really helpful for daily office calls. Once the code is clean and tested, I will package the final APK and set up the Play Store ready build alongside the complete source code delivery so you own everything. Which version of FreePBX are you currently running on your server? Best, Salma Noreen

@eliaa

Hello, I see you want to develop a business app with SIP integration for communication. Ensuring low latency and reliable call connectivity in mobile SIP apps can be tricky due to varying network conditions. With over 10 years of experience and expertise in Flutter for mobile and backend skills in Laravel and PHP, Smart Sols can build robust solutions handling these challenges well. What specific SIP features or protocols do you want the app to support initially? Excited to connect and start shaping your app.

@extreamcode

Hello, Your real challenge is not just placing calls, it is keeping SIP registration reliable when the app is backgrounded while making every call control feel native and dependable. I can build the Android business app with SIP login, incoming and outgoing calls, dial pad, call history, speaker, mute, hold, and Asterisk/FreePBX integration, then deliver the complete source code plus an APK and Play Store-ready build. I will structure the SIP and background-call flow carefully, validate registration and call-state handling across realistic network conditions, and collaborate with you on the server credentials, Android behavior, and release requirements. I’ve shared an initial estimate based on your description, and once we go over a few technical or functional details, I’ll confirm the exact cost and delivery schedule. We can begin by confirming the SIP library, authentication flow, and target Android versions, then proceed through an agreed test build and final handover. Should background incoming calls remain reliable after Android force-closes the app, and can you provide the Asterisk/FreePBX SIP transport, codec, and push-notification requirements? Best regards, Asad A key consideration is whether the app must remain registered after force-closing, and how Asterisk/FreePBX currently exposes SIP credentials and transport settings. I would also confirm whether push notifications are available for background incoming calls and whether call history should be stored locally or

@UzeeTech

Hi, I can build your SIP business application for Android. With 7+ years of mobile development experience across Android, Java/Kotlin and Flutter, I've built communication apps with real-time calling and clean call interfaces. My approach: a native Android app (Java or Kotlin) with a PJSIP-based SIP stack, integrated with your Asterisk/FreePBX server. It includes SIP login, a clean dial pad, incoming/outgoing call screens, call history, and in-call controls (speaker, mute, hold). For background incoming calls, I'd use a foreground service plus push notifications to wake the device, with auto-start. I'd handle the SIP registration lifecycle (Android 12+ restrictions), audio routing (earpiece/speaker/Bluetooth), and call-quality testing. Deliverables: full source code, a signed APK, and a Play Store-ready build with correct manifest/permissions. I can deliver within 10 days at $120. Two questions: are the Asterisk/FreePBX server credentials ready for testing, and should the app support multiple SIP accounts or just one?

@GridsmithLTD

Hello, I reviewed the requirements and the core challenge is building a stable SIP calling application that maintains reliable registration, background incoming calls, and consistent call controls while integrating cleanly with Asterisk or FreePBX. I would structure the app around secure SIP authentication, incoming and outgoing call handling, dial pad, call history, background call notifications, and speaker, mute, and hold states with the SIP layer properly separated from the UI. I have worked on communication focused mobile applications and API integrations and can share relevant examples once we connect in chat. Also a quick question, is your Asterisk or FreePBX server already configured with the required SIP extensions and transport settings for mobile clients? Best Regards, Gridmith Ltd

@ayesha86664

Hi there! I understand you need a reliable Android SIP calling app that connects smoothly with Asterisk or FreePBX. The key challenge is making incoming calls work reliably in the background while keeping calling controls and SIP registration stable. I have experience with Android development, Java, VoIP applications, SIP integration, and backend communication. I can work with Asterisk and FreePBX environments and build clean calling interfaces with practical call management features. I will implement SIP login, dial pad, call history, incoming and outgoing calls, speaker, mute, and hold controls. I will also handle background incoming calls and test the connection with your SIP server. The project will include complete source code and an APK ready for Play Store submission. check our work https://www.freelancer.com/u/ayesha86664 Do you already have the SIP server credentials and Asterisk or FreePBX setup available? Let me know if you’re interested & we can discuss it. Best Regards Ayesha

@ranjika08

As an app developer with over a decade of experience in diverse aspects of the digital industry, I am confident that my skills and background make me an ideal fit for your App Developer for SIP Integration needs. From Android to Java, I have spent years honing my skills in precisely the areas you are seeking expertise in and have successfully delivered a variety of apps. I understand the substantial role that seamless SIP integration plays for a business application and possess extensive knowledge not only in incorporating SIP login, incoming/outgoing call functionality, dial pad and call history, Speaker/Mute/Hold options but also in integrating SIP server support with Asterisk/FreePBX as well as ensuring background incoming call functionality. Moreover, with several mobile apps already deployed on the Play Store, I'm well-versed with the entire development process right from code delivery to ensuring a completely functional APK. My goal is to bring your vision into reality by leveraging my experience and expertise while offering you dedicated support even after project completion. Let's make your app a powerful tool for your business!

@michela542

Hello, As a Full-Stack AI Engineer with a deep experience in the realm of mobile app development, I believe I am uniquely well-suited for your SIP integration project. My focus on building intelligent systems and my understanding of backend and frontend technologies including Android and Java positions me to design and develop your business application with extraordinary functionality. In addition to this, my experience in creating Voice AI applications and Automation systems perfectly complements your project requirements. I have previously built numerous voice-driven applications for call automation, appointment booking, lead qualification, and more. My knowledge of VAPI, Twilio, Retell AI and ElevenLabs will ensure that your app's dial pad functions seamlessly, integrating with the Asterisk/FreePBX system as required. Finally, my ability to create maintainable code means that you can expect a fully functional application not only for the present but future-proofed for scalability as well. I am confident that my skills, coupled with my commitment to efficient communication and reliable delivery, make me the best fit for what you need. Let's join forces to bring your vision to life! Thanks!

@juanestebana17

Hi , Good morning! I am professional mobile programmer with skills including Java, Mobile App Development, Asterisk PBX, VoIP and Android. Please send a message to discuss more about this project. Talk to you soon

@longngoc2307

Hi, there. "SIP ANDROID VOIP APP" - you need a reliable Android business dialer with SIP authentication, two-way calling, background incoming calls and full call controls connected to Asterisk/FreePBX. I can build this in Java with a SIP/VoIP stack supporting SIP registration, incoming/outgoing calls, dial pad, call history, speaker, mute and hold. I will handle background incoming-call behavior, connection/reconnection states and integration with your Asterisk/FreePBX configuration, then test the main call flows before delivering the complete source code, APK and Play Store-ready build. Can you provide the Asterisk/FreePBX SIP configuration details and confirm whether you need push notifications for incoming calls when the app is fully closed? Looking forward to working with you.

@SidUSA

Hello! I can help build your custom SIP business application, connecting your dialer directly to Asterisk and FreePBX. Maintaining reliable background incoming calls tends to get tricky because modern mobile operating systems kill idle background TCP connections to conserve battery life. I handle this practically by integrating platform-native push notification proxies to wake the app instantly on incoming INVITE signals. Just to clarify, are you planning to use PJSIP or Chan_SIP on your server end? Recently, I have built a similar VoIP dialer app with background call capabilities, dial pad history, and audio management features. Using Flutter alongside native SIP libraries, I delivered full source code and a production-ready APK published directly to the Play Store. Best, Quantum Code Solution

@naseeb1995

Hello Your App Developer for SIP Integration aligns perfectly with my expertise in mobile app development. Key Features: • Android Apps • iOS Apps • Cross-Platform Solutions • Flutter Apps • API Integrations • User Authentication • Push Notifications • Payment Gateways • Cloud Services • Admin Dashboards • Analytics Tracking • App Optimization • App Store Submission • Security Best Practices • Long-Term Support I focus on delivering high-quality mobile applications that combine performance, functionality, and excellent user experience. Best Regards, Naseeb A.

@Ariiba67

Hi, would you like the first build to focus on getting SIP calling and reliable background incoming calls working smoothly with your Asterisk/FreePBX setup? I can build the app with SIP login, dial pad, call history, incoming/outgoing calls, speaker, mute and hold controls. I’ll also handle SIP server integration, testing, source-code delivery, and provide a Play Store-ready APK/build. Share your preferred platform and SIP server details, and I can get started.

@markkien

Hi, I can see the challenge is, I guess the real challenge is that the app must act as a full SIP client while maintaining a responsive UI and seamless background handling on Android. I will architect the solution using a modular MVVM pattern with a dedicated SIP service (pjsip library) detached from the UI, exposing a coroutine-based API. Incoming/outgoing call logic will be routed through a single CallManager that persists state in a Room database, ensuring call history accuracy even after app restarts. Background handling will leverage WorkManager and persistent notifications to keep the SIP thread alive, while the UI updates via LiveData observers. I will reuse the existing pjsip stack and Asterisk/FreePBX SIP credentials, avoiding changes to the server side. Deliverable: A production‑ready Android APK and full source code, including a Google Play‑ready bundle, with documented Gradle scripts, a test suite, and a quickstart guide. I have deployed multiple SIP‑based Android clients to production and achieved 99.9% uptime. I can start immediately. Regards.

@MuhammadAkif8

Hello, this app needs reliable SIP calling in the background with a simple dialer interface, while keeping calls stable with Asterisk/FreePBX. I’ll focus on making the calling flow responsive and reliable across recent Android versions. I’ll handle SIP login, incoming/outgoing calls, dial pad, call history, speaker, mute, hold and background incoming-call handling, with proper SIP server integration. I will provide the complete source code along with a tested APK and Play Store-ready build. Please share which SIP library or server configuration you are currently using so I can confirm the integration approach before starting. Best regards, Akif F.

@selaaf

Background incoming calls on your Asterisk/FreePBX server are the part I'd sort out first, because Android is strict about apps that ring while asleep. First I'd get SIP login and one working call in and out of a single extension, so you can test it on a real phone early. My price is USD 97.50 over 7 days: 50% when login and calling work on a phone, 50% at handover with the source code, APK and Play Store-ready build. Bug fixes and support after handover are part of the deal. Which FreePBX version are you running, and can the server side be adjusted if background calls need it? Send the server details when you have them and I'll start from there. Sela