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I will develop custom voip softphone app, linphone sip app, twilio calling app
Caleb Martin
About this gig
I help businesses and startups build powerful, custom VoIP softphone apps using Linphone with advanced features and reliable performance. Whether you need a branded mobile app or a complete communication solution, I deliver secure, scalable apps for Android and iOS.
My solutions include high quality audio and video calling powered by modern codecs, multi user conferencing, real time messaging, and smart push notifications. I also integrate SIP trunking, DID numbers, eSIM support, and APIs like Twilio, WebRTC, and FreePBX to ensure seamless connectivity.
You'll get features like auto dialer, multi call handling, remote configuration, and synced contacts via LDAP or CardDAV. Security is a top priority, with strong encryption protocols such as SRTP, ZRTP, and more.
With solid experience in VoIP and Linphone development, I focus on delivering smooth, fully customized apps that match your brand and business goals.
Lets build your secure and feature rich VoIP appmessage me to get started quickly.
Get to know Caleb Martin
Caleb Martin
VoIP and Softphone App Develope
- FromUnited Kingdom
- Member sinceMar 2026
- Avg. response time1 hour
Languages
English, Spanish
I specialize in building reliable and scalable VoIP, softphone, and calling applications tailored for businesses and startups. With hands on experience in Linphone, SIP, Twilio, and WebRTC, I develop custom solutions for call centers, telecom services, and mobile apps. From branded softphone apps to full VoIP systems with calling, messaging, and automation, I focus on performance, clean UI, and seamless communication. Let’s turn your idea into a powerful, user friendly app that delivers real results.
My Portfolio
FAQ
What do you need to get started?
I will need your project requirements, preferred features, target platform (Android, iOS, or both), and any API details (SIP, Twilio, PBX, etc.). If you’re unsure, I can guide you.
Can you develop apps for both Android and iOS?
Yes, I can build cross platform or native apps for both Android and iOS depending on your project needs.
Do you provide SIP, Twilio, or PBX integration?
Yes, I integrate SIP, Twilio, FreePBX, 3CX, and other VoIP systems to ensure smooth calling and communication features.
Will my app be fully branded?
Absolutely. I can customize the app with your logo, colors, and UI to match your brand identity (white label solution).
Do you include call recording and auto dialer features?
Yes, advanced features like call recording, auto dialer, and multi call management can be included in higher packages.
Is the app secure?
Yes, I implement strong security protocols such as SRTP, ZRTP, and other encryption methods to protect user data and calls.
