Followed instructions in http://www.zoiper.com/en/tutorials/push-notifications
When script is run once - nothing happens despite success answer from Microsoft notify server.
Interestingly, calling push.sh several times in a row does cause ZoiPer to wake up and send REGISTER packet. There is nothing on the phone screen and attempt to make incoming call still fails.
Is there anyone here who was able to configure incoming calls?
Are provided instructions still valid?