VOIP/ Android app consultant

I have android app what use voip for calling between registered user. App do not use phone number for contacts, app use usernames stored in database and search function, after finding some user using search you can call him by click on username. On server is installed kamailio for single calls and asterisk for conference calls.


1. App has voice latency 1 - 1.5 sec. and I need decreased latency on 150 - max. 300 milisec. or on the same level as Skype on the same network path.

2. App has problems with call connections. App usually connect first call and after ending this call next call has no connection, sometime has ring and connection ( voice ) but usually no ring, no connection, no voice. Server is Linux, for single calls we use Kamailio and for conference calls we use asterisk.

My developers think that have idea how to fix these problems but anyway, maybe they will need few hours of consulting about mobile voip ( latency, connection ). If you have expert knowledge in this field I will pay you per hour for consulting and advices. We need REALLY EXPERT knowledge and experience for voip/android because developers are very experienced and do not need basic advices. Advantage is your work on similar voip app ( in Google store ).

Skills: Android, VoIP

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About the Employer:
( 21 reviews ) Zagreb, Croatia

Project ID: #4611827

7 freelancers are bidding on average $31/hour for this job


I am expert in VoIP and have some expirience with development for Android. I don't have own products for Android, but was involved in debugging and improving of CSipSimple, so I think I can help you. I am located In U More

$26 USD / hour
(1 Review)

please check PM.

$22 USD / hour
(1 Review)

Hello servlet4me, Ready to start.

$20 USD / hour
(4 Reviews)

Please check PM Thanks!

$21 USD / hour
(3 Reviews)

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

$15 USD / hour
(2 Reviews)

The call connections are a NAT problem. It can only be solved with TCP. Many things can cause latency, including program design and server layout. On Android, large latency can be caused by using the Java API to sam More

$83 USD / hour
(0 Reviews)

Hello, We have a team of designers and developers focus on developing and implementing enterprise products and solutions. We have over five years of experience, a passion for providing great service. Since we had si More

$21 USD / hour
(0 Reviews)

Hi We have read your requirements. We are interested in your project as we have indepth expertise in android app development. Please check private message board for details.

$30 USD / hour
(0 Reviews)