SipManager.newInstance returns null

Question

I implement simple SIP client app for receiving calls. I go through official manual and get code from it.

I noticed that

SipManager.newInstance(getApplicationContext());

returns null. Documentation says that it happens when SIP API is not supported by device. However I use LG G6 with Android 7.0 and I successfully test third-party SIP clients from Google Play. So I doubt that API is not supported really. How could I check that?

My manifest has all permissions (INTERNET and USE_SIP)

Permission for USE_SIP is granted by user

Answer 1

The Problem is that Android SDK is not supported over all the devices.
you can check first whether it is supported on current device:

 if(SipManager.isVoipSupported(getApplicationContext())){
     Log.d("VOIP:", "Supported!");
 }
 else{
     Log.d("VOIP:", "Not Supported");
 }
 if(SipManager.isApiSupported(getApplicationContext())){
     Log.d("API:", "Supported!");
 }
 else{
     Log.d("API:","NotSupported!");
 }

Sometime API is supported but not VOIP. I tested on Moto E 2nd Gen. and Moto X 2014, 1st Gen. Both API and VOIP is not supported on Moto X and Only API is supported on Moto E, but VOIP is not.
To avoid this caveat, you can use 3rd party APIs such as Doubango.

Source: SIP on Android: This Article discusses this problem in detail and suggest alternative APIs.