XML push client/phone intiated?

[Karl_Yealink]

XML PUSH is a feature which server Push something to phone, and the phone recognize the message and take effect.
As you attach, it's TextScreen.php, if server Push this to phone, the phone will popup a text on screen.

No matter the phone in which side, the point is that the server's network can connect to phone's network. So the phone can receive PUSH XML message.

And as floor 2 words, if your request is not as Push XML feature, please tell me detail request.