Hiya Rob,
Heard you on the FreePBX Live show the other day, nice to hear a local accent 
and yes, also interesting in any training that you can bring to Australia. I got a little excited, because I thought if it ever happens chances are it might happen in Brissie first 
I’m still not having any luck with my issue. I get disconnect cause=127 from the Cisco debugs which afaik means nothing. I’ve attached a debug (nope, can’t attach txt files try this instead http://pastebin.com/tBSA76aB), I know you’re not exposed to this much anymore but I’m reaching out anywhere I can.
I also wonder (due to experiences with PJSIP and Cisco 79xx’s) that maybe it doesn’t like chan_sip on port 5061. Is it possible to setup an unauthenticated PJSIP trunk?
Anyway, I’m drawing blanks - there mustn’t be a lot of difference between chan_sip on Asterisk 11 versus Asterisk 13…