Integrate Linphone with asterisk for push notification

I have installed the asterisk server and compiled the latest linphone iOS source code. Now all works great without being background and lock phone screen, calling.

When app is closed or iPhone screen lock, I can not receive call from other linphone (download from playstore).

I have registered both linphone to asterisk server using SIP.

I have also created development/distribute certificates, APNS, VOIP push on apple account.

But still i can not receive call to iOS app, So my question:

1. Will i have to use Any push supported proxy for that like flexisip, Opensips, kamailio etc. or I can just use Asterisk and Linphone or any other way to get notification when app is closed or lock screen?

Also will have to use any third party server for push notification to wakeup the app, like pusher, onesignal?

Thanks

You can use flexisip. It semi-working and no documentation

You can use asterisk or kamailio, but you should do push yourself by external scripts and dialplan.