Upwork home
Sign up
Project Catalog
DesignDesign
Video & AudioVideo & Audio
Development & ITDevelopment & IT
MarketingMarketing
Writing & TranslationWriting & Translation
MoreMore

You will get VoIP mobile softphone Linphone , PJSIP or WebRTC Mobile application

Parmar K.
Parmar K. Parmar K.
4.3
Preview imagePreview imagePreview imagePreview image

Let a pro handle the details

Buy Custom Mobile Apps services from Parmar, priced and ready to go.

You will get VoIP mobile softphone Linphone , PJSIP or WebRTC Mobile application

Parmar K.
Parmar K. Parmar K.
4.3
Preview imagePreview imagePreview imagePreview image

Let a pro handle the details

Buy Custom Mobile Apps services from Parmar, priced and ready to go.

Project details

I can deliver the custom mobile VoIP application which includes the below features.

OVERALL FEATURES
Audio & video calls
Multiple calls management (pause & resume)
Call transfer
Audio conferencing (merge calls into a conference)
Instant Messaging with XMPP, SIP , socket.io or firebase
Contact list
Call History
Display of advanced call statistics
Echo Cancellation
Call quality indicator
Secure communications: ZRTP, TLS, SRTP

ADVANCED FEATURES
All Audio and Video Codec supports
HD video support
Integration with push notification (requires compatible SIP server)
Low bandwidth mode for audio calls over 2G networks.
Call handover accross network access type change (start a call in wifi and continue in 3G)
Ability to configure multiple proxy accounts with different transports (UDP, TCP, TLS)
IPv6 for iOS

LINPHONE CUSTOMIZATION

Customize logo and App (White label Linphone)
Customize Application Theme
Customize Login and Registration flow
Customize Call and Chat feature
Linphone SIP and RTP encryption

You can ask for a free quote for customization
You can send me an email or send a personal message in my inbox. We can discuss your Linphone and VoIP requirements.
Platform
Android
App Type
Native App
Development Technology
React Native, Java, Kotlin
App Purpose
Chat, Delivery, Entertainment, Education, IoT, Maps & Navigation, Productivity, Restaurant, Shopping, Social Networking
Expertise
Cross Browser & Device Compatibility, Design, Performance Optimization
What's included
Service Tiers Starter
$250
Standard
$500
Advanced
$995
Delivery Time 7 days 15 days 30 days
Number of Revisions
03Unlimited
Number of Mobile Operating Systems
111
App Store Upload
-
-
App Icon Design
Splash Screen
Ad Network Integration
-
Source Code
-
Optional add-ons You can add these on the next page.
Fast Delivery
+$80 - $300
Additional Revision
+$30
iOS App with same features (+ 7 Days)
+$250

Frequently asked questions

4.3
19 reviews
68% Complete
(13)
16% Complete
(3)
5% Complete
(1)
5% Complete
(1)
5% Complete
(1)
Rating breakdown
Availability
4.4
Deadlines
4.3
Skills
4.4
Cooperation
4.3
Quality
4.3
Communication
4.3

NS

Nikhil S.
4.00
Apr 17, 2025
30 minute consultation Great experience working with Kaushik. He provided valuable insights, quick solutions, and a clear understanding of VoIP infrastructure.

SL

Steve L.
5.00
Mar 2, 2025
SIP App Developer It was a pleasure working with Kaushik and the rest of the knowledgeable team at Celloip. I would highly recommend them for anyone looking for expertise in the VoIP, cellular or mobile application field.

AD

Abdulah D.
4.45
Oct 31, 2024
Link livekit with SIP issue

GN

Graham N.
5.00
Oct 1, 2024
iOS Dev with Twilio

PC

Pedro C.
3.15
Sep 27, 2024
Kamailio / Asterisk architecture analysis & review Contractor has a team with significant Voip/Sip knowledge. In our particular case we also required strong Kamailio expertise and that wasn't so strong.
Parmar K.

About Parmar

Parmar K.
VoIP | WebRTC | Flutter | ReactNative | Android | iOS Developer
100% Job Success
4.3  (19 reviews)
Bhavnagar, India - 3:03 pm local time
I am working In VoIP , Android and iOS since last 12+ year. I have provided wide range of Technical solutions in VoIP, WebRTC, Website and Mobile Application development areas to startups , mid level and enterprise companies.

I have expertise with VoIP mobile development, Android/iOS application development, Flutter Development, ReactNative Development and Web application developments with specialty in developing Asterisk, FreeSWITCH, OpenSIPs, Kamailio, OpenSER, VoIP/SIP, ASTPP, WebRTS and Mobile VoIP based solutions.

I have worked on 25+ Linphone, PJSip and WebRTC Based Mobile VoIP Diallers with 100% Client satisfaction. I can also provide customized Class-4 and Class-5 Softswitch for your VoIP business.

Please refer below services I can provide.
- Linphone Mobile VoIP Dialler development
- PJSIP Mobile VoIP Dialler development
- Asterisk Server Installation, development , customization and maintenance.
- FreeSwitch Server Installation, development , customization and maintenance.
- Kamailio and OpenSips Server Installation, development , customization and maintenance.
- Android Application development
- iOS Application development
- Web Application Development
- RectJS and ReactNative Web and Mobile Application development.
- Testing and bug fixing in existing applications.
- Consulting for ongoing projects.
- Can provide consulting for projects related to Android, iOS, ReactJS, Asterisk , FreeSwitch , Opensips, Kamailio, ASTPP, RTPengine, MediaProxy, RTPproxy, FreePBX and A2Billing.
- Expert in developing Flutter WebRTC Applications.
- Expert in developing ReactNative WebRTC Applications.

✅ Mobile Softphone development
- Linphone, PJSIP, WebRTC, Any Proprietor SIP SDK integration, Agora Integration, LiveKit Integration, Custom WebRTC Development

✅ VoIP
- Freeswitch, Asterisk, FreePBX, FusionPBX, Kamailio, Opensips, ASTPP

✅ React
- ReactJS, NextJS, ReactNative, Mobex, Axios, MaterialUI, React-Bootstrap, TailWindCss

✅ NodeJS
- NodeJS, NestJS, Middleware, Typescript, Javascript, AWS Deployment, CI/CD Deployment

✅ Mobile Application
- Flutter, ReactNative, Android Kotlin, Android, Swift, Objective-C, SwiftUI

✅ HTML, JS, CSS, Bootstrap, Vanila Script, Jquery

You can message to discuss your requirements in detail.

Steps for completing your project

After purchasing the project, send requirements so Parmar can start the project.

Delivery time starts when Parmar receives requirements from you.

Parmar works on your project following the steps below.

Revisions may occur after the delivery date.

1. Gather Linphone customization information

I will gather Linphone customization information as initial steps. I will need Wireframes or Mobile Application screens to start custom design. If you need it with default Linphone UI then I will keep Linphone UI with minor customization.

2. Custom Desing implementation

Implement custom design provided in requirement

Review the work, release payment, and leave feedback to Parmar.