DTA not registering by trixbox serverve

hi all

I have a DTA off shore that works fine. The DTA has a dynamic IP so I installed No-ip.com which works great when the pc thats installed there is on. whether on or off thats not a problem. The problem is that when the IP changes noip does the trick but the trixbox server does not refresh that IP in order to connect.

i configures that DTA as an extension and where you put dynamic or the ip I put the DNS that was given to me by noip.com " blabla.noip.biz" but it does not automaticly update the ip from there. my question can I go about this another way? what would make this ip refresh itself. the only way it does it is if i hit apply without changing anything and hit save. then it starts working fine.

Thanks
rrichiez