" Shalom Bayis is shrouded in secrecy. Its hotline number is not listed. Its leadership is unclear, as is the scope of its business. The organization's spokesman, who goes only by the name Yossi, said he is an ultra-Orthodox Jew. He refused to be interviewed in person or reveal information about himself. He said the operation averages 100 calls a day. Whether that number is accurate or not, Chaim Shaulson, editor of two Jewish weekly newspapers in Brooklyn, said he knows of at least five ultra-Orthodox marriages in Borough Park that include live-in concubines. Many of the men recorded on hotline tapes obtained by The News said their marriages had been arranged when they and their wives were teenagers and that they have little or nothing in common except their children. "Good evening," said one caller. "I am a married Hasidic man. I have a family with children. I don't get from my wife what I am supposed to get. If there is anyone out there who could do better, please call.