Yep I'm going to be one of those guys.  Have spent several hours today trying to set up vfx today to no avail and about to bash my head against the wall knowing me I'm probably missing something simple.  Anyway I was wondering if someone can help me with this? I found this thread from a year ago http://www.geekzone.co.nz/forums.asp?forumid=65&topicid=164433 but haven't found anything on there that has been able to help me. Here are the settings emailed me from wxc: 

Below are some basic settings for your Asterisk server, these settings are not intended as a guide to setting up Asterisk, but will provide you with the necessary details to register with the VFX service.

Trunk/Peer Settings:
[General]
port = 5060
dtmfmode = rfc2833
disallow=all
allow=g729
allow=ulaw
allow=alaw
allow=g722

registertimeout = 20
regseconds = 180

[VFX]
type=peer
fromuser=033850848 ; this is your Voice Number i.e. 09950XXXX
host=pan.wxnz.net
insecure=invite,port
canreinvite=no
nat=yes
secret=xxxxxxxxxxxxxxx
username=xxxxxxxxxxxxxxxx

Here are the settings I have tried the first 2 images are of the voip basic setting page and the last 3 are of the voip advanced setting page (sorry didn't know how to save them as 1 image each) 

I have played around with settings for hours but haven't had any luck would really appreciate any advice on getting things up and running, thank you.