SIP-GSM Gateway for Android -- 2

Have you done it already ? or have some ? send me proof that you can make calls sip to gsm and have both way audio

marcin(at)[login to view URL]

then we will talk about rest

I need an application that can send/receive calls through SIP (Can use any sip stack like sipdroid) and forward it to the GSM network. The application should then forward the audio and convert from SIP to GSM and vice versa.

The app should be able to run on cheap devices (+-100$).

I was thinking on a way to emulate a headset and set it as default, so just need to initiate a call on gsm network using core android functions and audio will be automatically forwarded. Maybe this is a solution.

Codecs: Minimum g711, desired g729.

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.


o The goal of this project is to develop an Android application that can send calls through SIP and forward them to the GSM network AND receive calls from GSM and forward to SIP. The application should then forward the audio and convert from VoIP (RTP) to GSM and vice versa.

o The app should be able to run on cheap devices (+-100$).


o Deliveries

o The application working in APK format

o Full source code

o Simple manual for compiling and generating the application from source


o Route call from SIP to GSM

o Route call from GSM to SIP

o Convert audio from/to SIP and GSM networks

o Can have 2 or more GSM chips (Only one call simultaneous but may choose the chip)

o Must be able to run on cheap devices like Samsung galaxy Y or Chinese devices like this ([login to view URL]).

o Able to run on Android 2.2 and up.

Application Configurations

o Enable or disable the app

o Enable to receive calls only on wifi or all networks

o Enable to route calls from GSM to SIP

o Choose a fixed number to send the call

o Enable to route calls from SIP to GSM

o Route the call to number on INVITE field or a custom field Or route the call to a fixed number defined by user

o Must run on background

o Must be very lightweight to run on small memory devices

o Configure SIP Accounts

o Create a mini dialplan to choose which chip to use based on techprefix

Sip Requirements

o Register on Sip Proxy/Gateway

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

o Make calls with or without authentication

o Forward DTMF digits using RFC2833 or inband

o Use codec G711 and GSM

o Be able to use codec G729

o Create a mini dialplan to choose which chip to use based on techprefix, per SIP Account

o Hability to register more than 1 SIP account (but receive just 1 simultaneous call)

o Be able to store a CSV with all calls made

Habilidades: Android, Arquitetura de software, VoIP

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Acerca do Empregador:
( 0 comentários ) Poland

ID do Projeto: #6826627

17 freelancers estão ofertando em média $2830 para esse trabalho


A proposal has not yet been provided

$3157 USD in 30 dias
(27 Comentários)

Hello Sir, First of all, we would like to tell you how we will initialize the project with you. We insist to follow these steps before you award the project to us: - We (technical team) will review the job and a Mais

$1804 USD in 20 dias
(73 Comentários)

A proposal has not yet been provided

$5263 USD in 30 dias
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Hi, I have read your post and understood your requirement and I have great experience in handling Native: iOS, Android, Windows8 (Objective-C, Swift, Java, C#), JNI, NDK (C/C++) - Web service: XML/J Mais

$3092 USD in 30 dias
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We will not change the price no matter what. Hello, We are experts in SIP/ VOIP Dailer as well as high level VOIP apps with multiple apps being developed and delivered to our multiple clients. Also please look Mais

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Hello sir. I'm a passionate iOS/Android developer with 6 years rich experience. I had worked extensively with objectiveC, swift, Java, C++, PHP, XCode, Eclipse to have a strong skill on OOP and beautiful design Mais

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A proposal has not yet been provided

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Yes, I have done this I am using a Sip server (open source) I can even show you how you can set the server yourself , using a free server for outbound from SIP to regular phone numbers : checkout http Mais

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Hi! I have checked your requirement carefully. I am a expert of WebSite development and mobile apps. I am an iOS/Android software expert with rich experience. I have built several successful iOS/android games: si Mais

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Hi, We have done similar application named "ChilliTalk".We have listed the application details below for your reference. We have 4+ years of experience in android and iPhone application development. We are mob Mais

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Dear Sir or Madam: we are small team of mobile development for android and ios. We can develop application for android and ios. Have done some of projects with clients based out in USA,Uk and [login to view URL] are profession Mais

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Hi, We have a very good skill set in iPhone, iPad, Android and Web Development. We reviewed your all requirement mentioned in Project description and we are enough capable to full fill your requirements. We already Mais

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being a fresher and a beginner, gaining experience as well as money is most important for me. so, i assure you that you will be delivered a good quality product on time.

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Hi, We have done many apps with these kind requirements. Here are some of our works. [login to view URL] [login to view URL] We need full specification in order to give you Mais

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