§1. If the attempt at reconciliation according to the norm of can. 1446, §2 proved useless and the judge thinks that the libellus has some foundation, the judge is to order within three days by a decree appended to the bottom of the libellus that a copy of the petition be communicated to the respondent, giving to the latter the opportunity to send a written response to the tribunal chancery within fifteen days.
§2. This notification has the effect of the judicial citation mentioned in can. 1512.
Source: Code of Canon Law (Vatican.va)