¹⁹. Release 1.0 of the CDPD System Specification failed to include the ability to validate individual multicast group members. We initially felt that since multicast address are not allowed to initiate data packets, there is really no security risk. However, a mobile could demand and cause the transmission of forward channel multicast frames. If the mobile device is not authenticated, it is possible to cause unnecessary forward channel traffic. Moreover, without group member authentication, it is not possible for the service provider to repudiate claims that the forward traffic is invalid. Now, if the service provider cannot accurately account for the traffic and accurately control the channel usage, they can’t run the network. Thus the need for individual group member authentication.