develop prototype SIP/VoIP to detect incoming ringings

Your task is to implement a prototype (in Java), which detects incoming SIP/VoIP calls and opens a browser with a URL.

The URL contains some query parameters, like the callers number.

As a UI-less (cmd line only) app on the desktop it will be so a simply app which does basically a call listening and triggering a browser based URL to show.

The listener shall be configurable, means

- what URL to call

- which phone numbers to ignore

- which phone numbers to track (regEx)

Please recommend what to use SIP-RI/SIP-Jain to detected phone calls.

You will get a SIP/VoIP account to be able to implement and test incoming calls (if you do not have your own)

Your task is to implement Java classes to be able to access details of incoming calls as a listener.

Implement JUnit test cases, which is showing how the implemented listener is required to be configured (regex, ignore numbers, URL) The Q-question is a formula, place result into the bid.

A good starting point for SIP starters may be:

[login to view URL]

[login to view URL]

You need to implement for:

- linux & windows (a basic java best practice and requirement, ensure system independent development)


only call from JUnit (no UI)

What is NOT needed:

- a UI (not required, implement a JUnit test to call your functions)

- a service architecture (like spring or JEE)

- any persistence

- a voice/audio implementation for SIP (only incoming ringing required)



very basic implementation of SIP

[login to view URL]


the rest of the above named requirements


with and without TLS / SRTP support

TLS / SRTP, shall be mandatory for later usage of this app

What are our requirements?

- your code passes checkstyle, pmd and spotbugs (we will share you a git repo with eclipse settings)

- JDK17

- maven

- 24/8 formula

- create a model class representing the input of your function

- create a service class implementing the logic

- create a unit test, which tests the service class

- we do NOT need a UI, we only need the model + service method to access the logic via JUnit

- if you need libs selenium or apache commons are fine. Other libs NEED prior clearance

- the runtime is JRE (no JavaEE nor Spring-container)

- delivery in our git


- we want to have a prototype/POC to fiddle around with the possibilities on our environment

- after the prototype phase, we will have more tasks to implement to a full app, so preferably you/your team will get also this tasks

- if you do a good job on supporting our team, we are open to integrate you into regular work and we will share you more tasks about SIP implementations

What is our budget?

we do not disclose our budget nor planned hourly rate. Offer us your best bid.

Your bid?

Place your best hourly bid. We do not want to negotiate with you anymore after getting in touch with you.

So place your best bid to save time here


We hire only open book bidders. No open book estimate results in no hiring. You get a task, you estimate cleanly, you provide the estimate, we review and maybe do queries about understanding, you get a confirm for the budget, we create milestones to it (at least 2, 1x implementation, 1x successful test), you deliver in the agreed budget.


Do not wait for our availability here. Just answer, just ask or just reply.

Kemahiran: Java, Pembangunan Perisian, Object Oriented Programming (OOP), SIP, VoIP

Tentang Klien:
( 45 ulasan ) Stuttgart, Germany

ID Projek: #34622087

26 pekerja bebas membida secara purata $18/jam untuk pekerjaan ini


Hi, Thank you for posting the project As you can see in our profile that we are mainly VoIP, Asterisk/Freeswitch, Kamailio/Opensip, and WebRTC experts and have vast experience of over 14yrs in call, chat audio, video Lagi

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Hi, I have read your post and understood your requirement. Looking for the freelancer to work on your next project? Or just need some issues/bugs/fixes ASAP? I have 11+ years of software experience in fortune 500 com Lagi

$20 USD / jam
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Hi, i can do java telephone api with junit. I have 14 year's of experience. Kindly go through my profile and if you find it suitable please reach out to me. I can start immediately to discuss about the requirement and Lagi

$20 USD / jam
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Hey, I am having more than 11 years of experience in VoIP, and hands-on expericing on Mobile dialer for Android and iOS, I am confident enough to work with you. I have gone through your requirements, and understand t Lagi

$18 USD / jam
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Hi. Thank you for invting. I have good experience with SIP/VoIP. Also, I am good at Java programming. Please send message for discuss further. Regards, Franklin

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Hello there, How are you doing? Just saw your project posted. just pin me. I need to ask some questions on this I am more than happy to discuss the task and work for you. That would be greater if I get some tasks so yo Lagi

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Hi i have done some work in SIP, for call handling i used low level jain-sip library and for audio/video i used jitsi library if you are interested i am ready to start work on it Thanks

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