corton payphone

I've posted this before, but I'll try once more. I have come across a Corton Communications payphone, WP 1000, hearing aid compatible, brand new-boxed with keys. I can't find anything about the company -- they were in Yonkers NY. If anyone has any info on them (they don't come packed with any data sheets), please contact me at snipped-for-privacy@muderick.com. Inside there is an RJ-11 jack and connections for L1,L2 andG. I assume that's for some sort of power connection -- there is an LCD display on the front. The board that these connections are on doesn't look like it's for 110VAC- But I have no clue as to what voltage, AC or DC it would require. I'll appreciate any info on it. I can't seem to hook up for a dial tone. Probably needs external power.