Android phone as GSM Gateway for VoIP -- 3

We need an application that runs on Android phones (4.0 or above) and can receive calls through SIP and forward it to the GSM network. The application should then forward the audio and convert from SIP to GSM and vice versa.

Full description below. Please review and message me with considerations. If any requirements are unable to be met, please let me know before we make a deal.



The application working in APK format

Full source code

Simple manual for compiling and generating the application from source

A SIP client running on another phone that connects to the server via WIFI and able to demonstrate the functionality in this project.


- Route call from SIP to GSM

- Convert audio from/to SIP and GSM networks

- Able to run on Android 4.0 and up.

Application Configurations

- No need root access

- Enable or disable the app

- Enable to receive calls only on wifi or all networks

- Enable to route calls from SIP to GSM

- Choose GSM module to use

- Must run on background

- Must be very lightweight to run on small memory devices

- Configure SIP Accounts.

Sip Requirements

- Register on Sip Server

- Receive call authenticated by IP, user/pass or no authentication.

- Make calls with or without authentication

- Forward DTMF digits using RFC2833 or inband

- Use codec G711 and GSM

- Be able to use codec G729

- Be able to store a CSV with all calls made

Habilidades: Java, Mobile App Development, Android, Asterisk PBX, VoIP

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Acerca do Empregador:
( 3 comentários ) kowloon, Bahrain

ID do Projeto: #27253339

5 freelancers estão ofertando em média $633 nesse trabalho


Hi, I'm a talented developer for iOS, Android and have 11 years full time development experience. I have already developed a great number of various applications, namely on-demand services, location-based apps, soc Mais

$750 USD in 10 dias
(20 Comentários)

Hi We develop the best mobile applications, loaded with user friendly features, to boost your business with latest niche technology and optimum cost. we are ready to build Android phone as GSM Gateway for VoIP Plea Mais

$750 USD in 18 dias
(14 Comentários)

Greetings, I believe what you want CANT be done on an android phone. I tried this about 18 months ago, and found out it was impossible at that time. am pretty sure nothing has changed in the android community since the Mais

$500 USD in 30 dias
(1 Comentário)

I can achieve the results that you are asking for.” 4) “I have attached samples of work very similar to what you are seeking.” 5) “I would love to work on your project.” 6) ” I read through the job details extremely ca Mais

$667 USD in 20 dias
(0 Comentários)

Hello, Hope you are doing Great !! Thanks for sharing your requirements on freelancer and providing us an opportunity to bid on your project. I have 6+ years experienced developer team and we already built 218 + proje Mais

$500 USD in 7 dias
(0 Comentários)