Actually solved this myself, Pre 7.0 (we are running 6.1) you DO need a 3rd party license for this phone to work with your system. After 7 it's no longer required.
I know I've seen this asked here before, none of the listed solutions worked for me. SIP trace from the phone below (IPs obscured)
Sep 26 15:07:47: TX 658 bytes Request msg REGISTER/cseq=56711 (tdta0x3286c8) to tcp xxx.xxx.xxx.xxx:5060:
REGISTER sip:xxx.xxx.xxx.xxx;transport=tcp SIP/2.0
Via...
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