Android APP (GSM to VoIP gateway)

In a scenario where there is:

- A Asterisk VoIP server (provided to you)

- A phone extension connected to the Asterisk server (provided to you)

You should build an Android APP that connects to the Asterisk Server and is able to do the following:

A) Receiving a GSM Call and Making a VoIP CALL

1) Automatically answer phone calls

2) Take GSM Audio call and create a voip IAX2 protocol call to a voip server

3) The app should receive the audio from the GSM call, encode it and send to the voip server

4) The app should receive the audio from the VOIP call, encode it and send to the GSM call

B) Receiving a VoIP Call and Making a GSM CALL

- The APP should be listening to a "mqtt" topic on a server and receive instruction on what to do.

- If the instruction is to "PlaceCall", it should receive the destination number and:

1) It should establish a GSM call to the destination

2) Execute the same steps A2, A3 and A4


- The Android app mentioned above

- An Asterisk configuration to: 1) receive the call and redirect to an extension and 2) receive a call from the extension and redirect the call to the Android APP

Generic Notes:

- The app should be Android Native

- The backend should run on Linux Ubuntu 18.04 (you can only install system packages that are distributed within the Ubuntu official packages - all other packages must be installed within the project).

- You should work over slack (not Freelancer chat)


- 10% on start after signing NDA

- 50% on first full test (no exception): all features must work (even if with bugs)

- 40% on full delivery

Taidot: Android, Mobile App Development, VoIP, Linux, Asterisk PBX

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Tietoa työnantajasta:
( 3 arvostelua ) Lisboa, Portugal

Projektin tunnus: #22229233

21 freelanceria on tarjonnut keskimäärin 789$ tähän työhön


Hi,. I have gone through the brief details mentioned on the job. I have done multiple jobs with Android, Asterisk PBX, Linux, Mobile App Development, VoIP which are the skills required to get this job done. Lets start Lisää

$750 USD 9 päivässä
(37 arvostelua)

Hi, Greetings of the day! I read your requirement for the App development! I am leading India based trusted mobile and web application development company having more than 10 years of experienced in creatin Lisää

$809 USD 40 päivässä
(46 arvostelua)

Hi, I'm a talented developer for iOS, Android and have 11.2 years full time development experience. I have already developed a great number of various applications, namely on-demand services, location-based apps, s Lisää

$750 USD 7 päivässä
(13 arvostelua)

Hi, I understood concept of GSM to VoIP calling Android app you want. I have expertise in Native Android app development. I agree to conditions you mentioned in Project detail. Q. Where will be Ubuntu server hos Lisää

$3500 USD 55 päivässä
(60 arvostelua)

Hello, i am expert in app development  I read your requirements an you need a application and i already done many project same as your requirement so please message me for more discuss We have already designed, develop Lisää

$250 USD 6 päivässä
(12 arvostelua)

Hi Domingos B. My name is Shadi Ghaith. I went through your project and will be happy to discuss as we have extended experience in mobile app development, android. I have been doing freelancing in Ireland since 2014 Lisää

$750 USD 7 päivässä
(1 arvostelu)

Hi, Thank you for your job posting. This job is an ideal match for my skills and experience. My skills are following. - Java, Kotlin - Rest API, JSON - 3rd party library(RxJava, Retrofit) I have rich experience android Lisää

$500 USD 7 päivässä
(7 arvostelua)

Hi, We have a specialized team for Android App development. We would not only provide you a great design but will also optimize the code for ultimate performance and save resources of both users and server. In short o Lisää

$1500 USD 25 päivässä
(2 arvostelua)

Hello , I have seen your requirement and I will do this in less time. you need a mobile application so I am interested in your job because I already completed this type of job. so i want one more similar job so i can Lisää

$255 USD 5 päivässä
(6 arvostelua)

Hi Hope you are doing well. I have reviewed your requirements and we can implement all of your requirements with high quality work. Please have a look at our company website. You will find our past works, ser Lisää

$500 USD 7 päivässä
(7 arvostelua)

How are you. I am an Android, iPhone app and Web Site expert with full experience for 7+ years. I have deep knowledge with Android, Swift, Kotlin, java, javascript, Php, React js, node js, Codeigniter, Zend, MySQL, Ora Lisää

$500 USD 7 päivässä
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Hi Thank you for your response. I just checked your project description, so it looks like a perfect fit on my skill sets. I have already developed a LinPhone App which based on LinPhone SDK. So your app based on GSM a Lisää

$700 USD 7 päivässä
(3 arvostelua)

Hi , I am experts in Android &IOS application development and I specialised in Open Source & SCM solutions, such as Git, Subversion, Mercurial and Atlassian's JIRA, Confluence and Stash and have worked in a Test-Drive Lisää

$400 USD 20 päivässä
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I am an informatic with more than 30 years of experience in Computer Security Professional, expert in ethical hacking, linux, blockchain, Telecommunications, Voip, networks, programming, server administration, asterisk Lisää

$750 USD 30 päivässä
(1 arvostelu)

Dear Client, How are you? As I'm a full stack Developer, I'm very familiar with Mobile App Development and Hosting & Deployment Server... I have expertise in App Design, API Integration with Server, MQTT, LOT system e Lisää

$500 USD 7 päivässä
(0 arvostelua)

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$400 USD 1 päivässä
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$637 USD 9 päivässä
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Hello, I am new to the platform and I would like to get my first project. I have 5 years of experience in software. I would like to know more. contact me to chat thanks

$1111 USD 7 päivässä
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Dear Hiring Manager, After reviewing your job description, it’s clear that you’re looking for a candidate that is extremely familiar with the responsibilities associated with the role, and can perform them confidently Lisää

$750 USD 7 päivässä
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Dear sir. Here is my work. I have checked your project description and requirements carefully. I am a senior iOS/android developer has 4 years of good experience. I will never make you disappointed. If you give me a ch Lisää

$500 USD 7 päivässä
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