1. A message delivery arrangement for use in situations where a plurality of users send voice or data messages and wherein said messages have recipients and said data messages are typically delivered to data terminals and said voice messages are typically delivered to voice terminals, said arrangement comprising means controlled by a potential message recipient for designating either a voice terminal or a data terminal as a prime message receptor for said recipient and for sending a notification of the arrival of either a voice or a data message to said prime message receptor, and means controlled by said prime message receptor for alerting said recipient of said notification after receipt by said prime message receptor.