[SR-Users] What to read after RFC 3261 to get started with Kamailio.

[Oivvio Polite]

I want to get started with Kamailio. So far I've understood that I
really need to grok SIP before tackling Kamailio so I'm reading the book
"SIP demystified" as the starting point of my Kamailio journey. After
that I will read RFC 3261. After that I think it's time to read
something that will give me good understanding of how to actually
implement applications with Kamailio.  Searching Amazon for Kamailio
returns "Building Telephony Systems with OpenSER" as the results that
seems to be most specific to Kamailio. This book is from 2008. Is it
still relevant or is it better to go with the online docs?

regards, Oivvio