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Android VOIP application - problems establishing a voice(RTP) connection

I have an Android VOIP application which has problems establishing a voice(RTP) connection. The application actually has two voice connection implementations: a custom one based on Sipdroid and an implementation made using built-in Android RTP API ([url removed, login to view]). And you only need to fix ONE of these.

The first(Sipdroid based) implementation doesn't work reliably - from some reason it occasionally fails to transfer voice (RTP) data between the caller and callee. Plus it rarely succeeds in establishing a connection between the caller and calle if one of them is using a Samsung phone. It appears that UDP hole punching doesn't work very well on Samsung phones. The second ([url removed, login to view]) implementation works almost perfectly. Its sole problem is that it has a terrible 2 - 4 seconds latency. I.e. it takes between 2 and 4 seconds for caller to hear what the calle said and vice versa.

So, long story short I need someone familiar with RTP protocol, Android networking and perhaps VOIP in general to either fix the current code or create a new RTP layer from scratch. If you have ever created a VOIP Android app that uses RTP protocol to transfer voice data you should be capable to fix this. Note that your job on this project is just to take care of RTP related code, everything else is in place and working.

If you don't have experience with this kind of applications don't bother bidding.

Skills: Android, Asterisk PBX, C Programming, Java, VoIP

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About the Employer:
( 21 reviews ) Zagreb, Croatia

Project ID: #4300724

Awarded to:


Hi Vladimir, As discussed I have bid on your project. Please award it so that we can get started.

$800 USD in 8 days
(0 Reviews)

10 freelancers are bidding on average $1040 for this job


We can do it...

$700 USD in 3 days
(13 Reviews)

I have experience of working on VOIP application based on XMPP(communication protocol) and RTP (data exchange). Please check your PMB for more details.

$700 USD in 15 days
(1 Review)

Hello, I can fix it, pls .contact me for details.

$700 USD in 15 days
(1 Review)

Respected Client, Please check PMB for listing and confident to complete the project with quality services.. Best Regards

$750 USD in 15 days
(2 Reviews)

Dear sir, We introduce ourselves as an IT company working almost in all technologies based on web and mobile devices. I have attached the work in PM that is relevant to your project. Please see to it and reply. More

$1550 USD in 20 days
(3 Reviews)

Hello, we can give you better android app for audio/video call with code in this work on all platform. Regards ieva technologies

$1800 USD in 7 days
(0 Reviews)

Dear Mr servlet4me! I'm interesting in your job. I have much experience. I can do this job.

$650 USD in 5 days
(0 Reviews)

Please see PMB

$2500 USD in 30 days
(0 Reviews)

We already developed VoIP App for Android. Pls look in your PMB

$1000 USD in 5 days
(0 Reviews)

Dear , Please contact me to get this work done. I am working as a Voip engineer. I have experience in setting up such projects in past. I will do it at very afordable price. Please contact me Thanks

$250 USD in 7 days
(0 Reviews)