How to implement realtime voice chat between Android and iOS devices?

Question

We need to implement realtime voice chat between Android and iOS devices.

It's been done in apps like Viber.

How should we go about it?

You will first need a central server which will re-route the voice data to and from your app. Your server will also have to take care of who is or is not online(who the user can call or cannot call). The server will simply be sending the received data so it is dealing with socket connections. I don't think it matters here whether the data comes from a iOS device or an Android device. — An SO User, Jun 20 '14 at 10:27
@LittleChild, Thanks! Could you recommend a specific server technology that we could use? — Emanuil Rusev, Jun 20 '14 at 10:29
@LittleChild so it will be like a phone call? basically he can use SIP protocol then — Niko Adrianus Yuwono, Jun 20 '14 at 10:34
@nayoso **HOW** is the OP's question :) A link to a resource will be awesome. *Even I would love to read about it* :) — An SO User, Jun 20 '14 at 10:35
http://stackoverflow.com/questions/10734519/voip-on-android-libraries-or-sample-code *ba dum tss* — An SO User, Jun 20 '14 at 10:36
http://developer.android.com/reference/android/net/sip/package-summary.html — An SO User, Jun 20 '14 at 10:36
@LittleChild Ah sorry I will add a new answer as what I did before from my experience before :) — Niko Adrianus Yuwono, Jun 20 '14 at 10:44
@nayoso You cannot write "I have used it" in **my** answer !!! :D That is such a lie! Come on!! LOL — An SO User, Jun 20 '14 at 11:00

score 5 · Accepted Answer · edited May 23 '17 at 11:44

What you are looking for is SIP

The Session Initiation Protocol (SIP) is a signaling communications protocol, widely used for controlling multimedia communication sessions such as voice and video calls over Internet Protocol (IP) networks.

Android provides the android.net.sip package which...

Provides access to Session Initiation Protocol (SIP) functionality, such as making and answering VOIP calls using SIP.

If you want a demo, please have a look at the documentation

Original Source: VOIP on Android libraries or sample code

another lib for Android :
https://code.google.com/p/csipsimple/
http://www.linphone.org/
http://mjsip.org/mjua.html http://www.doubango.org/

For iOS, you can use PJSIP

PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. It combines signaling protocol (SIP) with rich multimedia framework and NAT traversal functionality into high level API that is portable and suitable for almost any type of systems ranging from desktops, embedded systems, to mobile handsets.

another lib for iOS :
http://www.linphone.org/
http://www.pjsip.org/
http://sofia-sip.sourceforge.net/development.html
http://savannah.nongnu.org/projects/exosip/

Original Source: How to implement VoIP + SIP in iPhone?

@EmanuilRusev AFAIK, you will need a SIP server which will re-route the voice data. So, what I pointed out is how you will code the app in Android. Similar functionality will exist in iOS, I am sure — An SO User, Jun 20 '14 at 10:42
the topic is closed but we still can put a comment, nice. @LittleChild,... what about if there's no SIP account? I mean, in ad-hoc communication usage, how would it be? — gumuruh, Aug 29 '14 at 03:53
@gumuruh I am not sure. Maybe create a one-time-use account every time the user logs in? Sorry for the delayed reply — An SO User, Nov 16 '14 at 07:48

How to implement realtime voice chat between Android and iOS devices?

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