WAP push - please fill in the blank

[Simon C. Wex]

I have an SMPP connection to an SMSC that I currently use for an 
application that acts as an SMS chat server.

I'd like to add mobile content delivery (ringtones, wallpapers etc) to 
the application. As I understand it, the best way to do this is via WAP 
push. So, sending the WAP Push message shouldn't be too complicated, but 
this is where my expertise (and I use that term lightly) ends.

I know I need to set up a WAP gateway (Kannel seems like the best 
choice) that will then proxy the request/response with my webserver. How 
do I get the wap server "addressed"? Is it simply over DNS? Do the 
carriers use the internet for communicating with WAP gateways?

If someone could explain this or point me to that document that I've 
been unable to find I would be eternally grateful.

Cheers, Simon.