security camera system IP Address problem - DirecTV

I have a DVR security camera system that was working grate with the IP address AT&T provided thru 253 Something has happen that has change the IP address to
And when I try to change the IP address to one of the original provided IP address Thru 253
And save it to the DVR It refer back to this IP Address And my cell phone will not let me communicat with the cameras but the internet is working great, Help!!! LOL

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