... well I think your missing something.....
DYNDNS, NO-IP, TYZ
they are just DNS servers, they will maps your IP address to a "name"
so instead of accessing "24.124.30.41", you would enter "Myname.dyndns.org" and that would be redirected to the corresponding IP....
So when the DNS-323 would connect to a tracker... it will still send the IP address... the fact that you use a DDNS provider will not change that....
DDNS are great when your public IP address (the one your ISP gives you) is dynamic, and you need to access a server on your network (like FTP or HTTP),
So in those cases we let the router or DNS-323 update the public IP address on the DDNS, a
and we do not have to care what is our current public IP address...
Has for which device get to handle the DDNS, I alway prefer the router...