Push server for iOS 4.0 onwards without using APNS

Apple iOS 4.0 onwards, multitasking is supported.

According to this post, we can make use of this and write of push server of our own registering our app as providing VoIP services.

I would like to know how it is possible to do in details and wou开发者_StackOverflowld like to have server side implementation ideas.

Thanks in advance.

To register your app as a VoIP app, you must have this functionality, otherwise Apple will reject it.

To use it, you can open a connexion between the server and the client using a socket, and for example show an alert when you have received some data.