Stampeding on an open door here, and not wanting to start a pun war ;)

http://www.amazon.com/Building-Telephony-Systems-OpenSIPS-1-6/dp/1849510741/ref=sr_1_1?ie=UTF8&qid=1361373796&sr=8-1&keywords=kamailio

Offcourse, it's not *AS* good as Kamailio, but if your into the book thing, it might help you to get your head around how the thing actually works. 

The question you ask, is actually a close to default setting of Kamailio, so I think you need to or:

1/ get your head around routing sip packets, which at starters is mindblowing, so give yourself some time.
2/ pay someone to set a kamailio up for you which does what you want. (I think almost anyone on the mailinglist here, can do that in a matter of hours)

Enjoy!


On 19 Feb 2013, at 10:52, Keith wrote:

Hi,
I am looking to build an SBC/SIP router made up from Kamailio and FreePBX. Calls will then need to be passed to multiple Asterisk media gateways. Can anyone point me to some documentation or help on how to do this?

--
Keith
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