Q. May a person in Israel call his relative in Toronto when it is still Shabbos in Toronto and leave a message on his answering machine?

A. Most Poskim permit telephone calling or answering, from a place where Shabbos has not yet began or is already finished to a location were it still is Shabbos, if one is calling or answering a Gentile or recording on an answering machine. (Shulchan Shlomo 1 p.528, Chelkas Yaakov 3: 106, Melachim Emanecha p. 120, Beer Moshe 6: 49, Betzel Hachochmo 3: 125). However, some disagree (see Piskei Teshuvos 344 note 8). Horav Shlomo Miller Shlit”a is matir.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit”a