What are you afraid that person will do if he recognizes your voice? After all, he's struggling with this also, so you two are in the same boat. I once walked into an SA meeting and my best friend was there. It was shocking at first, but it added such a layer of depth to our relationship that it was as if we were getting to know each other for the first time. Not only that, but my wife ended up talking to his wife about it and really helped his wife out a lot. Also, I've known Duvid Chaim for years and had no idea that he had this problem. When I heard he was leading this call, I called him up and said "David, this is Daniel ------, I just want to let you know that I am also a sexaholic and wanted to ask permission to join your call. I don't want you to feel uncomfortable." Now we have a REAL relationship, whereas before we didnt even really know each other. So, I hate giving advice, but maybe you should send Duvid an email
duvidchaim@gmail.com and voice your concern to him and listen to what he says. Or just think about it seriously yourself. By keeping your anonymity, you might be jeopardizing your recovery. Is it really worth it? Nothing we say is allowed to leave the line anyways, and if you want you can call this guy and tell him how important it is that he doesn't tell anyone you're on the line. I'm sure he will respect your wishes, as his anonymity can also be jeopardized now that you know who he is. After all, this is pekuach nefesh. This disease emotionally and spiritually kills is and threatens to take away everything we hold dear. And unfortunately, without recovery it only gets worse. It might be worth it. Not to mention, that many people get found out sooner or later, whether it's by their wife, their boss, or other members of the community. Better that this guy, a fellow sexaholic, should find out than any one of those. Kal Tuv.
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