Apple Push Notifications in Internal Network

I am trying to implement an enterprise iPad app which consumes web services accessible only through my company internal network through VPN setup.But In order to achieve Apple push notifications i cam to know that it should be public network.

Queries:

1. Is it possible to receive the push notifications over internal VPN setup in ipad just by unblocking the port 5223 (or)
2. Is it mandatory that device should be in public network to receive notifications.

Any suggestions or bes开发者_JAVA技巧t alternatives for implementing Apple push notifications over VPN are highly appreciable

Thanks in advance.....

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You'll also need to unblock 2195 to stream your notification requests to Apple, and 2196 for the feedback service.