One embodiment relates to a processing method for a communication intended for at least one receiving terminal. The method may comprise receiving a communication intended for the at least one receiving terminal and obtaining a certified identifier and an uncertified identifier of a sender of the communication, the identifiers being comprised in a signal message for the communication. The method may further comprise comparing the certified identifier with the uncertified identifier and processing the communication including a process for searching for the certified identifier in a list containing certified identifiers for senders associated with uncertified identifiers of those senders; the processing process being based on the results of the comparison process and the searching process.