Connecting two or more persons by telephone without any person having to give their telephone coordinates. A messaging server adapted to send to one or more invited persons a message sent by an inviting person and containing an invitation to communicate by telephone, to create automatically a number dedicated to a telephone call in which at least one invited person has agreed to participate, and to broadcast the dedicated number to the inviting person and to the invited person(s) who have agreed to participate. An exchange is adapted to connect at least two calls to the dedicated number.