Figured I was doing something dumb on my vanilla asterisk box so I've temporarily setup trixbox on an old laptop but still cant get things to work.

Making calls outwards is fine but inbound dont work work I get the following whenever I try and register (where MyVFXNumber = without leading 0)
:

Reliably Transmitting (NAT) to 58.28.20.150:5060:
REGISTER sip:as.wxcnz.net SIP/2.0
Via: SIP/2.0/UDP LANIP:5060;branch=z9hG4bK21ef4d27;rport
From: <sip:register=MyVFXNumber@as.wxcnz.net>;tag=as753146ae
To: <sip:register=MyVFXNumber@as.wxcnz.net>
Call-ID: 19bca31c54183f097dc38d0837cdefa6@127.0.0.1
CSeq: 102 REGISTER
User-Agent: Asterisk PBX
Max-Forwards: 70
Expires: 120
Contact: <sip:MyVFXNumber@LANIP>
Event: registration
Content-Length: 0


---

<--- SIP read from 58.28.20.150:5060 --->
SIP/2.0 404 Not found
From: <sip:register=MyVFXNumber@as.wxcnz.net>;tag=as753146ae
To: <sip:register=MyVFXNumber@as.wxcnz.net>;tag=1429232167-1206335151738
Call-ID: 19bca31c54183f097dc38d0837cdefa6@127.0.0.1
CSeq: 102 REGISTER
Via: SIP/2.0/UDP LANIP:5060;received=MyPubStaticIP;rport=5060;branch=z9hG4bK                                    21ef4d27
Content-Length: 0


<------------->
--- (7 headers 0 lines) ---
Really destroying SIP dialog '19bca31c54183f097dc38d0837cdefa6@127.0.0.1' Method                                    : REGISTER


sip show registry produces:
as.wxcnz.net:5060               register=995       120 Request Sent

Any ideas?