problem with a phone mh9915?

i have a model mh9915 that i haven't used in a extended time because i have moved to a new residence so the phone hasn't been in use for a couple of years . i have put a new battery in it but it doesn't get dial tone ; a red light is on for charging thou the battery is new .i tried calling the system that the phone is hooked up to but got nothing with my cell on this phone but did on other phones that are on this same system . i have lost the manual that came with the phone . i like this phone because it is cordless and because it was stored it is in new condition ,so i would like to put it back on line .
thank you for your time and what information you can help me with .i don't have the manual or the box i kept for so long