How to set up Kannel without using a 3rd party gateway service?

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Newsgroups gmane.comp.mobile.kannel.devel
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I'd like to set up Kannel to send SMS messages without going through a 3rd party gateway like Clickatell or Twilio. In other words, I'd like to connect to the SMPP server for each wireless services (AT&T, Verizon, etc.).

How difficult/easy is it to run a Kannel server this way?
Each SMSC has to be configured for each mobile network. What is the support like for each network in the US (AT&T, Verizon, T-mobile, Sprint) and what does it take to set up a contract with the carrier?
Can someone point me to a tutorial/blog for pulling this off (besides the docs)?
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