How to implement VoIP + SIP in iPhone? [closed]

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I want to develop a VoIP application for iPhone .

But I don't know the basics of VoIP concepts and also if there are any sources or library available that can I use in my application .

So if anyone can provide me VoIP learning resources or library or anything that is useful in terms of VoIP and iPhone it will be precious to me .

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If it's still relevant: use pjsip . It's a SIP library written in C. You must compile the source for iphone, it is described in the docs here. After that take a look at a very basic sample application here. It isn't very hard to use even if you don't know C, or how to compile libraries. Which was my case.

UPDATE Please be aware that pjsip uses GPL license.

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Another option is Twilio Client which has an iOS SDK. With Twilio you don't have to maintain any of the telephony infrastructure.

(I worked at Twilio)

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I think you should check my answer in this link.

iOS: Open Source VoIP/SIP Objective-C Code

Also check

SIP library for iOS with non-GPL license

You can also try OZeki,SIphone etc

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There is a helper to handle calls in iOS Apple Standard library CallKit Apple Documentation - CallKit

There is one lecture about it here WWDC 2016

And, there is a tutorial in Ray Wenderlich here

You still might need some library to handle SIP connections and handle incoming calls.

Open source library linphone

Paid library voipsipsdk