The best way make asterisk as background sip server for flexisip, it main, that all call from linphone must be going to flexisip/redis -> asterisk (pjsip/mysql). In the flexisip site you very simple can implement push certificate from apple to the push server. Another way - not exist. Maybe last version asterisk can be working with push, but you must ask in Asterisk forum how to implement Push Server from Apple to the Asterisk. Im not finding severals year ago.
Best Regards, Alex
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I use a softphone Linphone (with IOS iPhone) registred on An Asterisk server (13.23.1).
When the application is open I can receive incoming calls but when it is on background I get a busy tone.
What should I do to receive incoming calls when Linphone is on backgroung ?
Thy for your help,